Hi,
I'm currently writing an app in which pixmaps (Gdk, not Gtk)in a
GtkDrawingArea can be dragged by using the mouse.To achieve this, I
connect to the usual mouse signals.
My problem is that the motion of the pixmaps is sluggish. The weird
thing is, if I run the program at the same time I run "Dia" (gtk drawing
program), the motion of my program all of a sudden becomes acceptable.
I've looked through "Dia'"s source, but cannot find what it's doing.
Cheers,
Alex Mathy
here's the code:
gtk_signal_connect (GTK_OBJECT (canvas), "motion_notify_event",
GTK_SIGNAL_FUNC (canvas_motion_notify_event), NULL);
gtk_signal_connect (GTK_OBJECT (canvas), "button_press_event",
GTK_SIGNAL_FUNC (canvas_button_press_event), NULL);
gtk_signal_connect (GTK_OBJECT (canvas), "button_release_event",
GTK_SIGNAL_FUNC (canvas_button_release_event), NULL);
gtk_widget_set_events (GTK_WIDGET (canvas), GDK_EXPOSURE_MASK
|
GDK_BUTTON_PRESS_MASK
|
GDK_BUTTON_RELEASE_MASK
|
GDK_POINTER_MOTION_MASK
|
GDK_POINTER_MOTION_HINT_MASK
|
GDK_ENTER_NOTIFY_MASK
|
GDK_LEAVE_NOTIFY_MASK
|
GDK_BUTTON_RELEASE_MASK
);
.
.
.
gint
canvas_button_press_event (GtkWidget *widget, GdkEventButton *event)
{
if (event->button == 1){
int i;
for (i=0;i<*(compCount);i++){
circObj* component;
component=getComponent(components,i);
if (isInComponent(component,event->x,event->y)==TRUE){
//start dragging!
selectedObj=component;
dragging=TRUE;
xInObj=event->x-component->x;
yInObj=event->y-component->y;
selectedType=SELECTED_COMPONENT;
gtk_timeout_remove(threadid);
return TRUE;
}
else {
}
}
}
return TRUE;
}
gint
canvas_button_release_event (GtkWidget *widget, GdkEventButton *event)
{
if (event->button == 1){
if (dragging==TRUE){
dragging=FALSE;
threadid=gtk_timeout_add(DELAY,circuitLoop,canvas);
//snap to grid:
}
}
return TRUE;
}
gint
canvas_motion_notify_event (GtkWidget *widget, GdkEventMotion *event)
{
int x, y;
GdkModifierType state;
if (event->is_hint) {
gdk_window_get_pointer (event->window, &x, &y, &state);
}
else
{
x = event->x;
y = event->y;
state = event->state;
}
if (state & GDK_BUTTON1_MASK){
if (dragging==TRUE){
if (selectedType=SELECTED_COMPONENT){
circObj* component=(circObj*)selectedObj;
component->x=event->x - xInObj;
component->y=event->y - yInObj;
redrawCanvas(canvas);
}
}
}
return TRUE;
}
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