On Wednesday 21 July 2004 7:30 pm, Christer Palm wrote:
>
> gtk_widget_translate_coordinates() with values from each of the text
> labels allocation's and the DrawingArea as the destination should do the
> job, I guess.
Hmmm. I've had a look at that and I can't see how it would work for my
problem...
I've taken the liberty of attaching some code which I've been using to
try and figure out how to do what I want. (it's not pretty, but it's
fine to prove the concept).
(As a bonus question, how do I stop the text items in the table from
"spacing out" when the window is maximized? I've played with the
pack box options, but to no avail).
--------8<-----snip----------------------------------------------------------------------
#include <stdio.h>
#include <stdlib.h>
#include <gtk/gtk.h>
void gui_create();
gint gui_darea_configure(GtkWidget *widget, GdkEventConfigure *event);
gboolean gui_darea_expose(GtkWidget *widget, GdkEventExpose *event);
void gui_redraw();
GtkWidget *window;
GtkWidget *darea;
GdkPixmap *pixmap = NULL;
int Darea_Width = 600;
int Darea_Height = 300;
#define MAX_NUM_LABELS 16
int main( int argc, char *argv[] )
{
GtkWidget *vbox, *hbox;
GtkWidget *toolbar, *table, *text;
GtkWidget *scrolled_window;
int i;
gtk_init(&argc, &argv);
/* Create the main window */
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_title(GTK_WINDOW(window), "Example");
gtk_window_set_default_size(GTK_WINDOW(window), 600, 300);
/* Create a vbox */
vbox = gtk_vbox_new(FALSE, 0);
/* Create a scollable window and add to the vbox */
scrolled_window = gtk_scrolled_window_new(NULL, NULL);
gtk_container_set_border_width(GTK_CONTAINER(scrolled_window), 2);
gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(scrolled_window),
GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
gtk_box_pack_start(GTK_BOX(vbox), scrolled_window, TRUE, TRUE, 2);
/* Create an hbox */
hbox = gtk_hbox_new(FALSE, 0);
gtk_scrolled_window_add_with_viewport(GTK_SCROLLED_WINDOW(scrolled_window), hbox);
/* Create a table */
table = gtk_table_new( MAX_NUM_LABELS, 3, FALSE );
gtk_box_pack_start( GTK_BOX(hbox), table, FALSE, FALSE, 0 );
gtk_table_set_row_spacings( GTK_TABLE(table), 2 );
gtk_table_set_col_spacings( GTK_TABLE(table), 2 );
gtk_container_border_width( GTK_CONTAINER(table), 2 );
/* Add labels */
for ( i = 0; i < MAX_NUM_LABELS; i++ ) {
text = gtk_entry_new_with_max_length(20);
gtk_entry_set_text(GTK_ENTRY(text), "Label");
gtk_widget_set_usize(text, 80, 20);
gtk_table_attach_defaults(GTK_TABLE(table), text, 1, 2, i, i+1 );
}
/* Create drawing area */
darea = gtk_drawing_area_new();
gtk_widget_set_usize(darea, Darea_Width , Darea_Height); /* DEBUG */
gtk_box_pack_start( GTK_BOX(hbox), darea, FALSE, FALSE, 0 );
/* Drawing area callbacks */
g_signal_connect(G_OBJECT(darea),"configure_event",
G_CALLBACK(gui_darea_configure), NULL);
g_signal_connect(G_OBJECT(darea), "expose_event",
G_CALLBACK(gui_darea_expose), NULL);
/* Add the vbox to the main window */
gtk_container_add(GTK_CONTAINER(window), vbox);
gtk_widget_show_all(window);
gtk_main();
}
gint gui_darea_configure(GtkWidget *widget, GdkEventConfigure *event)
{
if (pixmap)
g_object_unref(pixmap);
/* Create backing pixmap */
pixmap = gdk_pixmap_new( darea->window, Darea_Width, Darea_Height, -1 );
gui_redraw();
return TRUE;
}
gboolean gui_darea_expose(GtkWidget *widget, GdkEventExpose *event)
{
/* Redraw backing pixmap region modified by event */
gdk_draw_drawable( widget->window,
widget->style->black_gc,
pixmap,
event->area.x, event->area.y,
event->area.x, event->area.y,
event->area.width, event->area.height );
return TRUE;
}
void gui_redraw( void )
{
int x, y;
/* Clear pixmap */
gdk_draw_rectangle( pixmap, darea->style->white_gc,
TRUE, 0, 0, Darea_Width, Darea_Height );
/**************************************************************************/
/* THE PROBLEM: How to ensure that each line is drawn such that it lines */
/* up with the associated text box on the left, allowing for user-defined */
/* Font sizes, widget decorations or what have you... */
/**************************************************************************/
for (y=0; y<Darea_Height; y+=20)
gdk_draw_line( pixmap, darea->style->black_gc, 0, y, Darea_Width, y );
}
--
David J. Singer
doc@xxxxxxxxxxxxxxxxxx
"Time flies like an arrow, fruit flies like a banana"
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