Nabble - Gtk+ - Apps Dev

gtkhtml fonts

2009-12-18T19:08:11Z

It used to be possible to change the font that gtkhtml used (for the
entire document) by calling gtk_widget_modify_font on the widget. It
seems in recent versions that this no longer works. I've played around
with setting styles on the widget and haven't gotten that to work
either. Does anyone know the reason for this or how to accomplish
this?

Thanks,
Matthew
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GtkComboBox submenus

2009-12-17T09:55:02Z

Is there a way to create GtkComboBox menus with submenus?

The logical way to achieve this would be to use a GtkTreeStore model,
and indeed it works as expected,
except that each first level item appears also as a second level title,
that can be selected...

disabling a first level item disables the whole subtree, so this cannot
be used to disable the second level titles...

Or the only solution is to use
gtk_combo_box_set_wrap_width (GTK_COMBO_BOX (combo), width)
with width > 1? My data has some nice structure, so the submenus
approach looks slightly better...

Cheers,
Carlos
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Re: GtkTreeView auto selecting row

2009-12-16T14:32:50Z

Hello.

Just call gtk_tree_selection_select_iter/path() and you should be good.

Tadej

--
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tadeboro@...
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GtkTreeView auto selecting row

2009-12-16T14:27:36Z

Is there a way to pre-select a row when the tree is first displayed. In
other words if the user hasnt yet selected a row it defaults to one
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Re: Storing images in GtkTreeView model

2009-12-16T13:26:12Z

Excellent thank you.

Tadej Borovšak wrote:

> Hello.
>
>
>> /lhs_store=gtk_list_store_new(2,G_TYPE_STRING,G_TYPE_PIXBUF); //2 cols, 1st
>> is string, 2nd is icon/
>>
>
> Store creation should be done like this:
>
> lhs_store = gtk_list_store_new( 2, G_TYPE_STRING, GDK_TYPE_PIXBUF );
>
> Hint: For most of GTK+/GDK types, you can get tybe by this simple convention:
> GtkWidget -> GTK_TYPE_WIDGET
> GdkPixbuf -> GDK_TYPE_PIXBUF
> ...
>
>
>> /gtk_list_store_set(lhs_store,&lhs_treeiter,0,"Subscribers",-1); //put
>> string in col0/
>>
>
> To store pixbuf in second column, do something like this:
> gtk_list_store_set( lhs_store, &lhs_treeiter, 0, "Subscribers", 1, pixbuf, -1 );
>
> Tadej
>
>

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Re: Storing images in GtkTreeView model

2009-12-16T11:34:58Z

Hello.

> /lhs_store=gtk_list_store_new(2,G_TYPE_STRING,G_TYPE_PIXBUF); //2 cols, 1st
> is string, 2nd is icon/

Store creation should be done like this:

lhs_store = gtk_list_store_new( 2, G_TYPE_STRING, GDK_TYPE_PIXBUF );

Hint: For most of GTK+/GDK types, you can get tybe by this simple convention:
GtkWidget -> GTK_TYPE_WIDGET
GdkPixbuf -> GDK_TYPE_PIXBUF
...

> /gtk_list_store_set(lhs_store,&lhs_treeiter,0,"Subscribers",-1); //put
> string in col0/

To store pixbuf in second column, do something like this:
gtk_list_store_set( lhs_store, &lhs_treeiter, 0, "Subscribers", 1, pixbuf, -1 );

Tadej

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Storing images in GtkTreeView model

2009-12-16T11:22:13Z

Im using a GtkTreeView with a GtkListStore to display a list of rows
with both text and a picture.

I can declare the model with just the text as follows:

/lhs_store=gtk_list_store_new(1,G_TYPE_STRING,); //1 cols(string)
/

but how do I decalre it to have a picture as well e.g the following-
which doesnt work. What type do I use for the second col?

/lhs_store=gtk_list_store_new(2,G_TYPE_STRING,G_TYPE_PIXBUF); //2 cols,
1st is string, 2nd is icon/

I can then add the text to the model easily with:

/gtk_list_store_set(lhs_store,&lhs_treeiter,0,"Subscribers",-1); //put
string in col0/

what I also want to do is put an image file in the other column

I know how to set up a pixbuf renderer in the view to display it but I
cant find an example showing how to store images in the model.
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Re: Addind 2 Widget in 1 Container....

2009-12-15T16:03:32Z

Hi !

GtkWindow is a container that can contain exactly one other widget.
>
> Other containers, e.g. Gtk[HV]Box, GtkTable, GtkLayout, ..., can contain
> more widgets organized in different ways. So put on of them to the
> window and pack the widgets to it.
> [...]
>
> Yeti
>

Thank you Yeti and Lars Wirzenius for your help.

I studied GtkLayout with the Gnome tutoriel and I found the solution.

I post it if it could help someone.

GtkWidget* draw_screen(GLOBAL_SKIN_INFOS *gsi) {

SKIN_INFOS *si;
si=malloc(sizeof(SKIN_INFOS));
gsi->si=(SKIN_INFOS*)si;
skin_load(gsi->si,gsi->SkinFileName);

/* Create the window */
GtkWidget *pImage;
GtkWidget *pWindow;
GtkWidget *pLayout;

GtkWidget *gtk_window_new(GtkWindowType type);
pWindow=gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_title(GTK_WINDOW(pWindow),"tilem");// define title of
the window
gtk_window_set_position(GTK_WINDOW(pWindow),GTK_WIN_POS_CENTER);

gtk_window_set_default_size(GTK_WINDOW(pWindow),gsi->si->width,gsi->si->height);

pImage=gtk_image_new_from_pixbuf(gsi->si->image);
gsi->pImage=pImage;

GtkWidget *pAf;
int screenwidth=gsi->si->lcd_pos.right-gsi->si->lcd_pos.left;
int screenheight=gsi->si->lcd_pos.bottom-gsi->si->lcd_pos.top;
pAf = gtk_aspect_frame_new(NULL, 0.5, 0.5, 1.0, TRUE);
gtk_frame_set_shadow_type(GTK_FRAME(pAf),
GTK_SHADOW_NONE);
{
gsi->emu->lcdwin = gtk_drawing_area_new();
gtk_widget_set_name(gsi->emu->lcdwin,
"tilem-lcd");

gtk_widget_set_size_request(gsi->emu->lcdwin,
screenwidth,
screenheight);
gtk_container_add(GTK_CONTAINER(pAf),
gsi->emu->lcdwin);
gtk_widget_show(gsi->emu->lcdwin);
}

/* ###SOLUTION### */
pLayout=gtk_layout_new(NULL,NULL);
gtk_widget_show(pAf);

/* Into GtkLayout : I put the GtkImage (x=0, y=0) and the drawarea (on
the GtkImage) :D */
gtk_layout_put(GTK_LAYOUT(pLayout),pImage,0,0);

gtk_layout_put(GTK_LAYOUT(pLayout),pAf,gsi->si->lcd_pos.left,gsi->si->lcd_pos.top);
/* Now I add the GtkLayout to the pWindow */
gtk_container_add(GTK_CONTAINER(pWindow),pLayout);
/* ###END### */

g_signal_connect(G_OBJECT(pWindow),"destroy",G_CALLBACK(OnDestroy),NULL);
/* Connection signal keyboard key press */
gtk_widget_add_events(pWindow, GDK_KEY_RELEASE_MASK);
gtk_signal_connect(GTK_OBJECT(pWindow), "key_press_event",
G_CALLBACK(keyboard_event), NULL);
gtk_widget_add_events(pWindow, GDK_BUTTON_PRESS_MASK |
GDK_BUTTON_RELEASE_MASK);
gtk_signal_connect(GTK_OBJECT(pWindow), "button_press_event",
G_CALLBACK(mouse_event),(gpointer)gsi);
gtk_widget_show_all(pWindow);

return pWindow;
}

One more times thank you.

Best regards.

Thibault Duponchelle
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Re: Addind 2 Widget in 1 Container....

2009-12-15T04:59:26Z

On Tue, 2009-12-15 at 13:50 +0100, Thibault Duponchelle wrote:
> So I "simply" search for a solution to contain a pixmap AND a drawarea .
> Use GtkBox is impossible because the pixmap must be in background and the
> drawarea center ON it.

Could you use only a GtkDrawingArea widget in the container and draw the
pixmap on the drawing area?

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Re: Addind 2 Widget in 1 Container....

2009-12-15T04:57:25Z

On Tue, Dec 15, 2009 at 01:50:56PM +0100, Thibault Duponchelle wrote:
> I 'm actually trying to add a GtkDrawingArea in a window that already
> contains a GtkImage.
> There's probably an easy solution for this but I didn't know it... :(
> So I show my code and I wait for suggestions... :D

GtkWindow is a container that can contain exactly one other widget.

Other containers, e.g. Gtk[HV]Box, GtkTable, GtkLayout, ..., can contain
more widgets organized in different ways. So put on of them to the
window and pack the widgets to it.

You may also wish to read the tutorial as it explains the concept of
widget packing.

Yeti

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Addind 2 Widget in 1 Container....

2009-12-15T04:50:56Z

Hi !

Firstly thank you for your help.

I 'm actually trying to add a GtkDrawingArea in a window that already
contains a GtkImage.
There's probably an easy solution for this but I didn't know it... :(
So I show my code and I wait for suggestions... :D

GtkWidget* draw_screen(GLOBAL_SKIN_INFOS *gsi) {

SKIN_INFOS *si;
si=malloc(sizeof(SKIN_INFOS));
gsi->si=(SKIN_INFOS*)si;
skin_load(gsi->si,gsi->SkinFileName);

/* Create the window */
GtkWidget *pImage;
GtkWidget *pWindow;

GtkWidget *gtk_window_new(GtkWindowType type);
pWindow=gtk_window_new(GTK_WINDOW_TOPLEVEL); //
GTK_WINDOW_LEVEL : define how is the window
gtk_window_set_title(GTK_WINDOW(pWindow),"tilem");
// define title of the window
gtk_window_set_position(GTK_WINDOW(pWindow),GTK_WIN_POS_CENTER); //
GTK_WIN_POS_CENTER : define how the window is displayed

gtk_window_set_default_size(GTK_WINDOW(pWindow),gsi->si->width,gsi->si->height);
// define size of the window

pImage=gtk_image_new_from_pixbuf(gsi->si->image); //Load a pixbuf
gsi->pImage=pImage;

GtkWidget *pAf;
int screenwidth=94; // fixed for the test
int screenheight=61; // idem
pAf = gtk_aspect_frame_new(NULL, 0.5, 0.5, 1.0, TRUE); // et pAf
! ça fait des Chocapic !!
gtk_frame_set_shadow_type(GTK_FRAME(pAf),
GTK_SHADOW_NONE);
{
gsi->emu.lcdwin = gtk_drawing_area_new();
gtk_widget_set_name(gsi->emu.lcdwin,
"tilem-lcd");

gtk_widget_set_size_request(gsi->emu.lcdwin,
screenwidth *
2,
screenheight *
2);
gtk_container_add(GTK_CONTAINER(pAf),
gsi->emu.lcdwin);
gtk_widget_show(gsi->emu.lcdwin);
}
/* HERE IS MY PROBLEM ! */
//gtk_container_add(GTK_CONTAINER(pImage),pAf);
/* OR */
//gtk_container_add(GTK_CONTAINER(pWindow),pAf);
/* END */

gtk_widget_show(pAf);
gtk_container_add(GTK_CONTAINER(pWindow),pImage);

g_signal_connect(G_OBJECT(pWindow),"destroy",G_CALLBACK(OnDestroy),NULL);
/* Connection signal keyboard key press */
gtk_widget_add_events(pWindow, GDK_KEY_RELEASE_MASK); // Get the event
on the window (leftclick, rightclick)
/*gtk_signal_connect(GTK_OBJECT(pWindow), "key_press_event",
GTK_SIGNAL_FUNC(keyboard_event), NULL); */
gtk_signal_connect(GTK_OBJECT(pWindow), "key_press_event",
G_CALLBACK(keyboard_event), NULL);
gtk_widget_add_events(pWindow, GDK_BUTTON_PRESS_MASK |
GDK_BUTTON_RELEASE_MASK);
gtk_signal_connect(GTK_OBJECT(pWindow), "button_press_event",
G_CALLBACK(mouse_event),(gpointer)gsi);
gtk_widget_show_all(pWindow); // display the window and all that it
contains.

return pWindow;
}

This code works but I can't add both widget...

So I "simply" search for a solution to contain a pixmap AND a drawarea .
Use GtkBox is impossible because the pixmap must be in background and the
drawarea center ON it.

Thank you for all.

I hope my english is not too bad.

Best regards.

Thibault Duponchelle
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How to make GdkPixbuf round-cornered

2009-12-14T22:25:07Z

Hi, all:

I want to load an image as a GdkPixbuf from a image file, then make it's
CORNERS totally transparency to create a round corner picture, and save it
back into an image file.

Now I just don't know how to make CORNERS transparency.

Anybody can help me?

Thank you in advance.

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TreeView column headers

2009-12-14T13:46:45Z

How can I make GtkTreeView column header clickable and non focusable
at the same time?

I want GtkTreeView not to pass focus to header area, but to keep it
ALWAYS inside (for items it contains) whenever focus enters (e.g. from
TAB key) or header is clicked.

Is this possible? & How?

Sebastian
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Problems with print preview

2009-12-14T00:22:15Z

I knew that GTK toolkit on Windows has major problems with drawing print
preview of a document, but it seems that the new GTK 2.18.x has the same
problem on Linux too.

Starting with Ubuntu 9.10 and Fedora 12, my print preview code just displays
blank pages now :( Note that the same code is tested and works on older
releases reaching as far back as Fedora 6 (haven't tested before).

The actual printing (tested printing to PDF) generates correct content, it
is just print preview that seems to be broken.

Can anyone confirm this ? Does anyone notice similar problems in other
programs ?
Any workaround ?

TIA,
Miroslav

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Re: getting button_press event for gtk_drawing_area

2009-12-13T19:41:44Z

Hi Carlos,

> > This has been working fine until being compiled with gtk+-2.18.0 but
> > does not work after that. Now I found that it worked with the later
> > gtk if I add GDK_BUTTON_RELEASE_MASK when calling
> > gtk_widget_set_events(). I don't know why... I even don't have the
> > callback for the event.
> >
> > I guess I am simply wrong with my coding. I appreciate if someone can
> > educate me a bit how this should be done correctly. The sample below
> > is still valid. (if you add GDK_BUTTON_RELEASE_MASK, it works)
> I know nothing about your problem, but it seems that in my GTK 2.18.3,
> button press events in drawing areas need GDK_BUTTON_RELEASE_MASK to
> properly work. This was not the case in older GTK versions (tested it
> with GTK 2.12.8).
>
> In my case, what I notice is: if I press a button over a drawing area,
> then I need to press twice a Cancel or a Ok button in a (window widget)
> dialog for this to be effective. It seems a problem of focus grab...
> adding GDK_BUTTON_RELEASE_MASK with gtk_widget_set_events the problem
> disappears...

Thanks. Sounds like the similar case. In my case if I press somewhere in
the window but out of the drawing_area(s), I can make the next press
effective. Indeed it looks like a focus problem.

If I am correct GDK_BUTTON_RELEASE_MASK has been set internally until the
specific commit. But it needs to be set by the application after the
change to work properly. I don't know how this works. Maybe there also is
some internal callback for this event and is doing some magic.

But thanks anyway. It was good to hear that someone else has the similar
issue and is workarounding the same way.

Regards,
Eigo
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Re: How to create a thumbnail of a picture?

2009-12-13T17:10:06Z

Thanks Lars.

On Fri, Dec 11, 2009 at 6:10 PM, Lars Wirzenius <liw@...> wrote:

> On Fri, 2009-12-11 at 17:50 +0800, Jianchun Zhou wrote:
> > Hi, All:
> >
> > Any body knows how to create a thumbnail of a picture in GTK+?
> >
> > I want to load an image, then output a file which is the resized image.
>
> The GdkPixbuf object is probably what you want. See
>
>
> http://library.gnome.org/devel/gdk-pixbuf/stable/gdk-pixbuf-file-loading.html
>
> http://library.gnome.org/devel/gdk-pixbuf/stable/gdk-pixbuf-file-saving.html
> http://library.gnome.org/devel/gdk-pixbuf/stable/
> http://library.gnome.org/devel/gdk-pixbuf/stable/GdkPixbufLoader.html
>
>
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>

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getting button_press event for gtk_drawing_area (was: calling gdk_x11_drawable_get_xid() causes corruption...)

2009-12-13T00:36:18Z

Hi,

In short what I want is "packing multiple gtk_drawing_area in a window
and getting button press event from each drawing area".

The drawing areas are meant for "animated video thumbnail"(shortened and
downscaled). When you clicking on a thumbnail, it starts the actual
playback on a different window.

It needs to get XID for each drawing area so that it can feed the
thumbnail video stream from gstreamer pipeline. Also the button press for
each drawing area needs to be distinguishable so that the program can
start the playback of the correct video. I would use the common callback
func for all the drawing area because the number of drawing area is
determined and changes at run time.

This has been working fine until being compiled with gtk+-2.18.0 but does
not work after that. Now I found that it worked with the later gtk if I
add GDK_BUTTON_RELEASE_MASK when calling gtk_widget_set_events(). I don't
know why... I even don't have the callback for the event.

I guess I am simply wrong with my coding. I appreciate if someone can
educate me a bit how this should be done correctly. The sample below is
still valid. (if you add GDK_BUTTON_RELEASE_MASK, it works)

-
Here is some additional note. Firstly I thought this is related with
gdk_x11_drawable_get_xid() because it happens only after I call the
function. However, by conducting "git bisect" against gtk repository and
identifying which exact code makes the change of behavior, I learned that
my guess was most likely wrong.

With a commit (6fef640debbe468586ff866cbef38d7a29c452d1),
get_native_event_mask() in gdk/gdkwindow.c is given much less 'default
(?)' event mask and GDK_BUTTON_RELEASE_MASK is one of those dropped. Then
I found that if I add it at application side, it works as I wish.

If someone wonders what the hell this is all about... you can find the
explanation on the application and download whole source at

http://drag0n.fam.cx/?page_id=237

Regards,
Eigo

-----
On Thu, 3 Dec 2009 00:21:59 +0200
Eigo Mori <eigom@...> wrote:

>
> Hi,
>
> I am having trouble to catch button_press_event on gtk_drawing_area
> correctly after calling gdk_x11_drawable_get_xid() for the
> drawing_areas.
>
> Please find the sample code below. It packs 10 drawing_area and set
> event handlers. When you click on the drawing_area, it prints out which
> drawing_area has been clicked. (i.e. 0-9)
>
> This seems to work as I hope if I don't call gdk_x11_drawable_get_xid
> (). If I call gdk_x11_drawable_get_xid(), it reports correct number
> firstly but keep printing out the same number even if I click on the
> different drawing_area later. XID itself seems to be collected
> correctly.
>
> This does not seem to occur with gtk+-2.18.0 or earlier but occurs with
> gtk+-2.18.1 or later.
>
> It is quite possible that my code is wrong and was working by luck. But
> I couldn't find the right way after some struggling... I will
> appreciate if someone can kindly educate me.
>
> -----
> /*
> xid_test.c
> gcc -g -Wall `pkg-config --cflags --libs gtk+-2.0 gdk-2.0` -o
> xid_test xid_test.c */
>
> #include <stdlib.h>
> #include <gtk/gtk.h>
> #include <glib.h>
> #include <gdk/gdkx.h>
>
> GtkWidget *hbox, *window, *drawing_area[10];
> GMainLoop *loop;
> gulong xid[10];
>
> static void
> click_handler( GtkWidget *widget, GdkEventButton *event, int* p )
> {
> g_printerr( "%dth icon clicked\n", *p );
> }
>
>
> static void
> expose_handler( GtkWidget *widget, GdkEventButton *event, int* p )
> {
>
> /*
> xid[*p] = gdk_x11_drawable_get_xid( widget->window );
> g_printerr( "getting xid for %dth icon : %ld\n", *p, xid[*p] );
> */
> gdk_draw_arc( widget->window,
> widget->style->fg_gc[GTK_WIDGET_STATE( widget )],
> TRUE,
> 0,
> 0,
> widget->allocation.width,
> widget->allocation.height,
> 0,
> 64*36*(*p+1)
> );
> }
>
> int
> main(int argc, char *argv[])
> {
> int i;
> int id[10] = {0,1,2,3,4,5,6,7,8,9};
>
> gtk_init(&argc, &argv);
>
> hbox = gtk_hbox_new(FALSE,0);
> window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
> gtk_widget_set_usize( window, 600, 50 );
> gtk_container_add(GTK_CONTAINER(window), hbox);
>
> for(i=0;i<10;i++){
> drawing_area[i] = gtk_drawing_area_new();
> gtk_signal_connect(GTK_OBJECT(drawing_area[i]),
> "button_press_event", GTK_SIGNAL_FUNC
> (click_handler), &id[i] ); gtk_signal_connect(GTK_OBJECT(drawing_area
> [i]), "expose_event", GTK_SIGNAL_FUNC(expose_handler), &id[i] );
> gtk_widget_set_events(drawing_area[i], GDK_EXPOSURE_MASK |
> GDK_BUTTON_PRESS_MASK); gtk_drawing_area_size(GTK_DRAWING_AREA
> (drawing_area[i]), 50, 50 ); gtk_box_pack_start(GTK_BOX(hbox),
> drawing_area[i], FALSE, FALSE, 2); }
>
> gtk_widget_show( hbox );
> for(i=0;i<10;i++){
> gtk_widget_show(drawing_area[i]);
> }
> gtk_widget_show( window );
>
> for(i=0;i<10;i++){
> /*
> seems that it does not matter whether you get xid here
> or in expose handler
> */
> /* works if you comment it out */
> xid[i] = gdk_x11_drawable_get_xid( drawing_area[i]->window );
>
> g_printerr( "getting xid for %dth icon : %ld\n", i, xid[i] );
> }
>
> loop = g_main_loop_new (NULL, FALSE);
> g_main_loop_run( loop );
>
> exit( 0 );
> }
> -----
>
> Regards,
> Eigo
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> gtk-app-devel-list@...
> http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list

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Re: How to create a thumbnail of a picture?

2009-12-11T02:10:06Z

On Fri, 2009-12-11 at 17:50 +0800, Jianchun Zhou wrote:
> Hi, All:
>
> Any body knows how to create a thumbnail of a picture in GTK+?
>
> I want to load an image, then output a file which is the resized image.

The GdkPixbuf object is probably what you want. See

http://library.gnome.org/devel/gdk-pixbuf/stable/gdk-pixbuf-file-loading.html
http://library.gnome.org/devel/gdk-pixbuf/stable/gdk-pixbuf-file-saving.html
http://library.gnome.org/devel/gdk-pixbuf/stable/
http://library.gnome.org/devel/gdk-pixbuf/stable/GdkPixbufLoader.html

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How to create a thumbnail of a picture?

2009-12-11T01:50:45Z

Hi, All:

Any body knows how to create a thumbnail of a picture in GTK+?

I want to load an image, then output a file which is the resized image.

Thanks.

--
Best Regards
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Re: callback function difference

2009-12-10T06:21:36Z

El jue, 10-12-2009 a las 22:05 +0800, Zhangwei escribió:
> hello
> i'm new in gtk
> i'm puzzled about the callback functions: g_callback() & gtk_signal_func()
> they looked same
> is there anyone can tell me the difference ?

There is none. The object/signal system of Gtk was split out into
GObject a long time ago, but part of the old system is still in Gtk for
compatibility reasons.
So while gtk_signal_func is a mere alias for g_callback, the former must
not be used in newly written code - in fact, it will be removed with the
release of Gtk+-3.0.

Regards,
Florian

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callback function difference

2009-12-10T06:05:18Z

hello
i'm new in gtk
i'm puzzled about the callback functions: g_callback() & gtk_signal_func()
they looked same
is there anyone can tell me the difference ?

thanks in advance!
sincerely

James
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Re: Window Managers Key Combinations and Accelerators

2009-12-09T13:06:06Z

On Wed, 2009-12-09 at 08:10 -0500, dhk wrote:

> Two things I would like to do is override the default Tab key press
> behavior and the Ctrl-Alt-Del behavior.

Tab is usually used by gtk+ (not the window manager) to move between
items e.g. in a dialogue box. Shift-tab does the same but in the
opposite direction.

Gnome-terminal overrides this, so you could look there.

Control-alt-del is interpreted (on Linux at least) by the X server,
depending on the value of the DontZap option in /etc/X11/xorg.conf,
and I think cannot easily be overridden by an application.

Liam

--
Liam Quin - XML Activity Lead, W3C, http://www.w3.org/People/Quin/
Pictures from old books: http://fromoldbooks.org/
Ankh: irc.sorcery.net irc.gnome.org www.advogato.org

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Re: Read-only controls

2009-12-09T07:27:50Z

Pierre Wieser wrote:

> Hi,
>
> Is there a standard Gtk way of defining controls as read-only at runtime ?
>
> In my user interface, I have entries, radio and toggle buttons, and
> a combo list ; I would set them as read-only when the current item
> cannot be updated for a reason or another.
>
> For now, I set all these controls as insensitive, but there is a real
> semantic difference between "a field is not available - doesn't make
> sense here" and "a field cannot be modified", and I'd wish my UI
> reflects this difference.
>
> What should I do for that ?
>

Entries: gtk_entry_set_editable()

For buttons, radios, and other items, setting them to insensitive should
be the appropriate thing to do. If you don't feel the same way though,
you can set callbacks on the buttons, radios, etc. and just not do any
of the actions the widgets would do.
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Read-only controls

2009-12-09T07:00:38Z

Hi,

Is there a standard Gtk way of defining controls as read-only at runtime ?

In my user interface, I have entries, radio and toggle buttons, and
a combo list ; I would set them as read-only when the current item
cannot be updated for a reason or another.

For now, I set all these controls as insensitive, but there is a real
semantic difference between "a field is not available - doesn't make
sense here" and "a field cannot be modified", and I'd wish my UI
reflects this difference.

What should I do for that ?

Thanks in advance.
Regards
Pierre
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Window Managers Key Combinations and Accelerators

2009-12-09T05:10:28Z

How can I prevent all or some window manager key combinations in my gtk
application?

To prevent the default F10 behavior I already use the following.
GtkSettings *gtk_settings;
gtk_settings=gtk_settings_get_for_screen(gdk_screen_get_default());
g_object_set(gtk_settings, "gtk-menu-bar-accel", NULL, NULL);

The "gtk-menu-bar-accel" string was something given from other
questions. Is there a list of other strings I can use in this place?

Two things I would like to do is override the default Tab key press
behavior and the Ctrl-Alt-Del behavior.

I'm using the GtkUIManager to set accelerator keys, but some keys like
the Tab key don't seem to work. I figured in my GtkActionEntry array I
could use "<tab>", but that doesn't have any affect. I'm guessing it's
the Window Manager overriding it. Is this correct or is it something
else? Also, is there a place I can find the mapping of the keys to
their string value?

Thanks,

dhk
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Re: Clearing GtkComboBoxEntry

2009-12-08T09:35:48Z

Carlos Pereira wrote:

> David is right,
>
> you should get the entry pointer with gtk_bin_get_child, and after
> that you handle this entry as any other entry:
>
> entry = gtk_bin_get_child (GTK_BIN (combo_entry));
> gtk_entry_set_text (GTK_ENTRY (entry), "");
>
> In GTK 2.0 you can also use this:
> gtk_entry_set_text (GTK_ENTRY (GTK_BIN (combo_entry)->child), "");
> but this is not going to work in Gtk 3.0, as these objects will be
> sealed from outside access.
>

I saw this in one an example somewhere and decided to ignore it for the
reason you mention.
> In my opinion, you should forget about redundant functions such as
> gtk_combo_box_get_active_text, having direct access to the entry pointer
> is much better.
>
Agree. Thanks.
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GTK+ 2.18.5 released

2009-12-08T08:34:45Z

GTK+ 2.18.5 is now available for download at:

ftp://ftp.gtk.org/pub/gtk/2.18/
http://download.gnome.org/sources/gtk+/2.18/

md5 sums:
3047875309f7f6030e03b0a95cf99c8c gtk+-2.18.5.tar.bz2
c60a0792c3065787f560d2c39ec0893b gtk+-2.18.5.tar.gz

sha1 sums:
ddb004f0f92f7c8e3b84237e05fcf0ef5affc79c gtk+-2.18.5.tar.bz2
4621e88939b15c73a6fe6fa43f88c33c1f66a9b3 gtk+-2.18.5.tar.gz

This is a bug fix release that contains a number of fixes to CSW corner
cases.

* Bugs fixed:
603652 Sporadic crashes with GtkSocket
598476 gnome-screensaver crashes when entering password...
601473 GDK_BUTTON?_MOTION_MASK appears to be broken
597386 Cannot click buttons more than once without...
603619 the colormap of offscreen's pixmap doesn't...
603904 gdk_draw_line doesn't have expose area.

These fixes have been contributed by Alexander Larsson and
Ray Strode.

December 8, 2009
Matthias Clasen

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Re: Clearing GtkComboBoxEntry

2009-12-08T07:16:07Z

David is right,

you should get the entry pointer with gtk_bin_get_child, and after that
you handle this entry as any other entry:

entry = gtk_bin_get_child (GTK_BIN (combo_entry));
gtk_entry_set_text (GTK_ENTRY (entry), "");

In GTK 2.0 you can also use this:
gtk_entry_set_text (GTK_ENTRY (GTK_BIN (combo_entry)->child), "");
but this is not going to work in Gtk 3.0, as these objects will be
sealed from outside access.

In my opinion, you should forget about redundant functions such as
gtk_combo_box_get_active_text, having direct access to the entry pointer
is much better.

Regards,
Carlos

> On Mon, Dec 07, 2009 at 07:52:02PM -0800, Steve Harrington wrote:
>
>> I have an application using GtkComboBoxEntry with a simple 2-column
>> int/char * ListEntry model. If the user enters data in the box (as
>> opposed to using a pull-down selector) I can access the index with
>> gtk_combo_box_get_active( GTK_COMBO_BOX(W) );
>> and the text with
>> gtk_combo_box_get_active_text (GTK_COMBO_BOX(W));
>>
>> The index is -1 as expected and the text is the text that what was entered.
>> The question is: How do I clear the text field when I have finished
>> with it.
>> From the FAQ and other documentation it seems that I should be able to
>> access the actual GtkEntry widget within the GtkComboBoxEntry widget,
>> get the GtkEntryBuffer, and clear it with
>> gtk_entry_buffer_delete_text(). None of these buffer functions/headers
>> are marked as depreciated but also none of them are my version of the
>> gtk headers (/usr/include/gtk-2.0/gtk/gtkentry.h) or anywhere else in
>> the gtk headers.
>>
>
> You can get the entry with gtk_bin_get_child(). At least that's what
> the reference docs say.
>
> Yeti
>
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>
>

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Re: Clearing GtkComboBoxEntry

2009-12-08T01:10:32Z

On Mon, Dec 07, 2009 at 07:52:02PM -0800, Steve Harrington wrote:

> I have an application using GtkComboBoxEntry with a simple 2-column
> int/char * ListEntry model. If the user enters data in the box (as
> opposed to using a pull-down selector) I can access the index with
> gtk_combo_box_get_active( GTK_COMBO_BOX(W) );
> and the text with
> gtk_combo_box_get_active_text (GTK_COMBO_BOX(W));
>
> The index is -1 as expected and the text is the text that what was entered.
> The question is: How do I clear the text field when I have finished
> with it.
> From the FAQ and other documentation it seems that I should be able to
> access the actual GtkEntry widget within the GtkComboBoxEntry widget,
> get the GtkEntryBuffer, and clear it with
> gtk_entry_buffer_delete_text(). None of these buffer functions/headers
> are marked as depreciated but also none of them are my version of the
> gtk headers (/usr/include/gtk-2.0/gtk/gtkentry.h) or anywhere else in
> the gtk headers.

You can get the entry with gtk_bin_get_child(). At least that's what
the reference docs say.

Yeti

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Clearing GtkComboBoxEntry

2009-12-07T19:52:02Z

I have an application using GtkComboBoxEntry with a simple 2-column
int/char * ListEntry model. If the user enters data in the box (as
opposed to using a pull-down selector) I can access the index with
gtk_combo_box_get_active( GTK_COMBO_BOX(W) );
and the text with
gtk_combo_box_get_active_text (GTK_COMBO_BOX(W));

The index is -1 as expected and the text is the text that what was entered.
The question is: How do I clear the text field when I have finished
with it.
From the FAQ and other documentation it seems that I should be able to
access the actual GtkEntry widget within the GtkComboBoxEntry widget,
get the GtkEntryBuffer, and clear it with
gtk_entry_buffer_delete_text(). None of these buffer functions/headers
are marked as depreciated but also none of them are my version of the
gtk headers (/usr/include/gtk-2.0/gtk/gtkentry.h) or anywhere else in
the gtk headers.
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RE: GtkGLExt (was Re: Gtk 3.0)

2009-12-07T11:26:11Z

Well... this seems to turn on a few flames... so let me put some of this to rest.
For anyone to say OpenGL is "niche", and does not apply to everyday apps, I again remind you of iChat and the OS X Panel. Granted it has only recently found prominence in the desktop but it is quickly making way as OGL hardware acceleration becomes standardize (has been for some time).
To look back at the past decade and say "look desktops are all 2D", not realizing it has to do with memory and CPU/GPU issues, which are no longer issues is simply wrong.
The next decade of desktops, more importantly GUI (Graphical USER <-- hello!!! Interfaces) WILL have a blinding array of 3D widgets which will be like eye candy to most users, and as they see it they will want it more and more.
I do NOT work at a facility which requires 3D visualization to accomplish its tasks, but users are starting to ask and want. "Can I do a walkthrough of our warehouse to see how much material I have?", "Can we have a little computerized white box, with a virtualized pallet to do color matching in?" This has NOTHING to do with scientific engineering or "niche" market. It has to do with the future of interface design. I work in a ink manufacturing plant, and by that argument, we should mix it all by hand, since that is how they did it 5000 years ago! 2D is NOT the end of all GUIs. It simply is not! R2 space can not hold as much date/widgets/whatever as R3 even if the axis were infinite! they (users) want 3D buttons that pop, role, jump, and wink at them too. They want there pictures to start bending, bouncing, and getting all organic on them.
To say that GTK does NOT need OGL, is to say they sun is not going to rise in the morning. To say that GTKGLext (a great tool to be sure) is good enough, is to slap a hand in the face of all of use who see where this is going.
The greatest problem with the linux community (one I myself am having to learn about) is this indelible ego that the data and function has to be correct and nothing else. Sorry.... if the user can not visually keep up or understand what you present, it won't make a difference how good the app works in the back, it IS the eye candy that gets the user to use it. GtkTreeview in 3D? I can thing of a dozen categorization applications in seconds.

FYI - OS X is a FreeBSD engin, with NextStep as its windowing system. It uses OGL IN the windowing system (quartz / composer), and it is the hottest desktop on the market. No one, and I mean no one, has even come close!
And lets not forget all the work that is being done on Compiz.... why? For the masochism of it?!? No! Because that is where the future of desktop are, in 3D space!
IMMHO, if Gtk is to keep up, as the cross platform interface it promises to be, it will need OGL to be fully modularized or integrated somehow. I don't even think GtkGLExt is that far, other than the OS X side of it, which with demand will certainly improve.
P.S.the comment: " Ah. You are such a loser. Go away.", has no business on this forum, the point is a good one, and your minimization of it, a poor show of understanding.

EMAILING FOR THE GREATER GOOD
Join me

> Date: Sat, 5 Dec 2009 19:48:06 +0100
> From: yeti@...
> To: jose.carlos.pereira@...
> Subject: Re: GtkGLExt (was Re: Gtk 3.0)
> CC: gtk-app-devel-list@...
>
> On Sat, Dec 05, 2009 at 04:22:36PM +0000, Carlos Pereira wrote:
> > We must atract more scientifc/engineering applications for Linux and
> > GTK, because this is exactly the kind of stuff that enterprises and
> > universities are demanding.
> >
> > If we have fantastic operating systems and desktop environments in the
> > free software world, but most of the scientific/engineering aplications
> > only run in Windows/Mac OS X, people will be forced to use them, even if
> > they would rather prefer to use Linux/BSD... I have many friends in this
> > situation...
>
> I'm afraid you explain it from your viewpoint. But looking at your
> reasoning from the `desktop' viewpoint there are troubles.
>
> 1) Objective. There will never ever be a scientific `killer app'.
> Every little branch of science, or even an individual scientific
> problem, has specific needs. Hence the applications are inherently
> scattered and each individual app is used only by a small group of
> people. Even the `universal' commerical tools such as Matlab are far
> from being universally used [among scientists]. This makes hard to see
> sci/eng apps matter *at all*.
>
> 2) Subjective. Do your graphs have round corners and include the user's
> IM status? Can your data acquistion software synchronize the data with
> an iPod? Are your reports summarized to 140 characters and sent to
> Twitter? No? Does your app help people with some difficult to
> understand and much more difficult to solve problems instead of
> facilitating idle chit-chat while consuming power for visual effects?
> Ah. You are such a loser. Go away.
>
> Regards,
>
> Yeti
>
> _______________________________________________
> gtk-app-devel-list mailing list
> gtk-app-devel-list@...
> http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list

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Re: getting GDK_GRAB_NOT_VIEWABLE for keyboard grab

2009-12-06T07:33:04Z

Hi!

Maybe your window isn't mapped yet from X (or just Gdk) perspective, so no
grabs are possible. You must wait GDK_MAP event -- try to connect-after
"map-event" of object->window and grab there. Must solve your problem, IMHO.

Most Gtk methods are not synchronous -- fullscreen() and show_all() just
queue operations into Gdk or send X requests and return.

--
Artur

06.12.09, 16:12, "Thura" <thurahlaing06@...>:

> I am trying to grab keyboard for my application window, and getting return
> value "3" (GDK_GRAB_NOT_VIEWABLE) ...
> Any clue?
> Here is my code.
> gtk_window_fullscreen (GTK_WINDOW(object->window));
> gtk_widget_show_all (GTK_WIDGET(object->window));
> int retval = gdk_keyboard_grab (object->window->window, FALSE,
> GDK_CURRENT_TIME);
> _______________________________________________
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Re: how to set gtkeventbox to respect background image

2009-12-06T04:59:03Z

Dear Friends

How to make gtk_event_box with an label inside respect the background image
defined on the window.
Other controls on same window like radios, checkbox and buttons, apear
correct on the image background

i create the background with the follow

void SetWindowBackImage(GtkFixed box, char * szFileName, int x, int y, int
h , int w )

GtkWidget * hCtrl;
GdkPixbuf * handle = gdk_pixbuf_new_from_file( szFileName, NULL );
GdkPixbuf * pHandle= alpha2pixbuf( handle, 16777215 );

hCtrl = gtk_image_new_from_pixbuf(pHandle);

if ( box )
gtk_fixed_put( box, hCtrl, x,y);
gtk_widget_set_size_request( hCtrl,h,w );
}

and the label i create with

void CreateLabel(GtkFixed box, char * cTitle, int x, int y, int h , int w )
{
GtkWidget * hCtrl, * hLabel;
GtkFixed * box;
GdkPixbuf * handle ;
GdkPixbuf * pHandle;

hCtrl = gtk_event_box_new();
cTitle = hwg_convert_to_utf8( cTitle );
hLabel = gtk_label_new( cTitle );
g_free( cTitle );
gtk_container_add( GTK_CONTAINER(hCtrl), hLabel );
g_object_set_data( (GObject*) hCtrl, "label", (gpointer) hLabel );
}
if ( box )
gtk_fixed_put( box, hCtrl, x,y);
gtk_widget_set_size_request( hCtrl,h,w);

}

Regards and thanks in advance
Luiz Rafael

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getting GDK_GRAB_NOT_VIEWABLE for keyboard grab

2009-12-06T00:12:53Z

I am trying to grab keyboard for my application window, and getting return
value "3" (GDK_GRAB_NOT_VIEWABLE) ...
Any clue?

Here is my code.

gtk_window_fullscreen (GTK_WINDOW(object->window));
gtk_widget_show_all (GTK_WIDGET(object->window));

int retval = gdk_keyboard_grab (object->window->window, FALSE,
GDK_CURRENT_TIME);
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Re: GtkGLExt (was Re: Gtk 3.0)

2009-12-05T10:48:06Z

On Sat, Dec 05, 2009 at 04:22:36PM +0000, Carlos Pereira wrote:
> We must atract more scientifc/engineering applications for Linux and
> GTK, because this is exactly the kind of stuff that enterprises and
> universities are demanding.
>
> If we have fantastic operating systems and desktop environments in the
> free software world, but most of the scientific/engineering aplications
> only run in Windows/Mac OS X, people will be forced to use them, even if
> they would rather prefer to use Linux/BSD... I have many friends in this
> situation...

I'm afraid you explain it from your viewpoint. But looking at your
reasoning from the `desktop' viewpoint there are troubles.

1) Objective. There will never ever be a scientific `killer app'.
Every little branch of science, or even an individual scientific
problem, has specific needs. Hence the applications are inherently
scattered and each individual app is used only by a small group of
people. Even the `universal' commerical tools such as Matlab are far
from being universally used [among scientists]. This makes hard to see
sci/eng apps matter *at all*.

2) Subjective. Do your graphs have round corners and include the user's
IM status? Can your data acquistion software synchronize the data with
an iPod? Are your reports summarized to 140 characters and sent to
Twitter? No? Does your app help people with some difficult to
understand and much more difficult to solve problems instead of
facilitating idle chit-chat while consuming power for visual effects?
Ah. You are such a loser. Go away.

Regards,

Yeti

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