/*! \brief Handles the press on a mouse button.
* \par Function Description
* It handles the user inputs.
*
* Three action are available: zoom in, pan and zoom out on preview display.
*
* \param [in] widget The preview widget.
* \param [in] event The event structure.
* \param [in] user_data Unused user data.
* \returns FALSE to propagate the event further.
*/
static gboolean
preview_callback_button_press (GtkWidget *widget,
GdkEventButton *event,
gpointer user_data)
{
Preview *preview = PREVIEW (widget);
GSCHEM_TOPLEVEL *preview_w_current = preview->preview_w_current;
gint wx, wy;
if (!preview->active) {
return TRUE;
}
switch (event->button) {
case 1: /* left mouse button: zoom in */
a_zoom (preview_w_current, ZOOM_IN, HOTKEY,
A_PAN_DONT_REDRAW);
o_invalidate_all (preview_w_current);
break;
case 2: /* middle mouse button: pan */
if (!x_event_get_pointer_position(preview_w_current, FALSE, &wx, &wy))
return FALSE;
a_pan (preview_w_current, wx, wy);
break;
case 3: /* right mouse button: zoom out */
a_zoom (preview_w_current, ZOOM_OUT, HOTKEY,
A_PAN_DONT_REDRAW);
o_invalidate_all (preview_w_current);
break;
}
return FALSE;
}
/*! \brief Handles the press on a mouse button.
* \par Function Description
* It handles the user inputs.
*
* Three action are available: zoom in, pan and zoom out on preview display.
*
* \param [in] widget The preview widget.
* \param [in] event The event structure.
* \param [in] user_data Unused user data.
* \returns FALSE to propagate the event further.
*/
static gboolean
preview_callback_button_press (GtkWidget *widget,
GdkEventButton *event,
gpointer user_data)
{
Preview *preview = PREVIEW (widget);
GschemToplevel *preview_w_current = preview->preview_w_current;
gint wx, wy;
if (!preview->active) {
return TRUE;
}
switch (event->button) {
case 1: /* left mouse button: zoom in */
a_zoom (preview_w_current,
GSCHEM_PAGE_VIEW (preview),
ZOOM_IN,
HOTKEY);
gschem_page_view_invalidate_all (GSCHEM_PAGE_VIEW (widget));
break;
case 2: /* middle mouse button: pan */
if (!x_event_get_pointer_position(preview_w_current, FALSE, &wx, &wy))
return FALSE;
gschem_page_view_pan (GSCHEM_PAGE_VIEW (preview), wx, wy);
break;
case 3: /* right mouse button: zoom out */
a_zoom (preview_w_current,
GSCHEM_PAGE_VIEW (preview),
ZOOM_OUT,
HOTKEY);
gschem_page_view_invalidate_all (GSCHEM_PAGE_VIEW (widget));
break;
}
return FALSE;
}
/* dir is either ZOOM_IN, ZOOM_OUT or ZOOM_FULL which are defined in globals.h */
void
a_zoom(GschemToplevel *w_current, GschemPageView *page_view, int dir, int selected_from)
{
g_return_if_fail (page_view != NULL);
GschemPageGeometry *geometry = gschem_page_view_get_page_geometry (page_view);
g_return_if_fail (geometry != NULL);
double world_pan_center_x,world_pan_center_y,relativ_zoom_factor = - 1;
int start_x, start_y;
double top, bottom, right, left;
/* NB: w_current->zoom_gain is a percentage increase */
switch(dir) {
case(ZOOM_IN):
relativ_zoom_factor = (100.0 + w_current->zoom_gain) / 100.0;
break;
case(ZOOM_OUT):
relativ_zoom_factor = 100.0 / (100.0 + w_current->zoom_gain);
break;
case(ZOOM_FULL):
/* indicate the zoom full with a negative zoomfactor */
relativ_zoom_factor = -1;
break;
}
/* calc center: either "mouse_to_world" or center=center or a
virtual center if warp_cursor is disabled */
if (w_current->zoom_with_pan == TRUE && selected_from == HOTKEY) {
if (!x_event_get_pointer_position(w_current, FALSE,
&start_x, &start_y))
return;
if ( w_current->warp_cursor ) {
world_pan_center_x = start_x;
world_pan_center_y = start_y;
} else {
left = ((geometry->viewport_left - start_x) * (1/relativ_zoom_factor) + start_x);
right = ((geometry->viewport_right - start_x) * (1/relativ_zoom_factor) + start_x);
top = ((geometry->viewport_top - start_y) * (1/relativ_zoom_factor) + start_y);
bottom = ((geometry->viewport_bottom - start_y) * (1/relativ_zoom_factor) + start_y);
world_pan_center_x = (right + left) / 2;
world_pan_center_y = (top + bottom) / 2;
}
} else {
world_pan_center_x = (double) (geometry->viewport_left + geometry->viewport_right) / 2;
world_pan_center_y = (double) (geometry->viewport_top + geometry->viewport_bottom) / 2;
}
#if DEBUG
printf("relative zoomfactor: %E\n", relativ_zoom_factor);
printf("new center: x: %E, y: %E \n",
world_pan_center_x, world_pan_center_y);
#endif
/* calculate new window and draw it */
gschem_page_view_pan_general (page_view,
world_pan_center_x,
world_pan_center_y,
relativ_zoom_factor);
/* Before warping the cursor, filter out any consecutive scroll events
* from the event queue. If the program receives more than one scroll
* event before it can process the first one, then the globals mouse_x
* and mouse_y won't contain the proper mouse position,
* because the handler for the mouse moved event needs to
* run first to set these values.
*/
GdkEvent *topEvent = gdk_event_get();
while( topEvent != NULL ) {
if( topEvent->type != GDK_SCROLL ) {
gdk_event_put( topEvent );
gdk_event_free( topEvent );
break;
}
gdk_event_free( topEvent );
topEvent = gdk_event_get();
}
/* warp the cursor to the right position */
if (w_current->warp_cursor) {
gschem_page_view_WORLDtoSCREEN (page_view,
world_pan_center_x, world_pan_center_y,
&start_x, &start_y);
x_basic_warp_cursor (GTK_WIDGET (page_view), start_x, start_y);
}
}
