本文整理汇总了C++中SPDesktop::set_display_area方法的典型用法代码示例。如果您正苦于以下问题：C++ SPDesktop::set_display_area方法的具体用法？C++ SPDesktop::set_display_area怎么用？C++ SPDesktop::set_display_area使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类SPDesktop的用法示例。
在下文中一共展示了SPDesktop::set_display_area方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: sp_zoom_context_root_handler
static gint sp_zoom_context_root_handler(SPEventContext *event_context, GdkEvent *event)
{
SPDesktop *desktop = event_context->desktop;
Inkscape::Preferences *prefs = Inkscape::Preferences::get();
SPZoomContext *zc = SP_ZOOM_CONTEXT(event_context);
tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
double const zoom_inc = prefs->getDoubleLimited("/options/zoomincrement/value", M_SQRT2, 1.01, 10);
gint ret = FALSE;
switch (event->type) {
case GDK_BUTTON_PRESS:
{
Geom::Point const button_w(event->button.x, event->button.y);
Geom::Point const button_dt(desktop->w2d(button_w));
if (event->button.button == 1 && !event_context->space_panning) {
// save drag origin
xp = (gint) event->button.x;
yp = (gint) event->button.y;
within_tolerance = true;
Inkscape::Rubberband::get(desktop)->start(desktop, button_dt);
escaped = false;
ret = TRUE;
} else if (event->button.button == 3) {
double const zoom_rel( (event->button.state & GDK_SHIFT_MASK)
? zoom_inc
: 1 / zoom_inc );
desktop->zoom_relative_keep_point(button_dt, zoom_rel);
ret = TRUE;
}
sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK | GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK,
NULL, event->button.time);
zc->grabbed = SP_CANVAS_ITEM(desktop->acetate);
break;
}
case GDK_MOTION_NOTIFY:
if (event->motion.state & GDK_BUTTON1_MASK && !event_context->space_panning) {
ret = TRUE;
if ( within_tolerance
&& ( abs( (gint) event->motion.x - xp ) < tolerance )
&& ( abs( (gint) event->motion.y - yp ) < tolerance ) ) {
break; // do not drag if we're within tolerance from origin
}
// Once the user has moved farther than tolerance from the original location
// (indicating they intend to move the object, not click), then always process the
// motion notify coordinates as given (no snapping back to origin)
within_tolerance = false;
Geom::Point const motion_w(event->motion.x, event->motion.y);
Geom::Point const motion_dt(desktop->w2d(motion_w));
Inkscape::Rubberband::get(desktop)->move(motion_dt);
gobble_motion_events(GDK_BUTTON1_MASK);
}
break;
case GDK_BUTTON_RELEASE:
{
Geom::Point const button_w(event->button.x, event->button.y);
Geom::Point const button_dt(desktop->w2d(button_w));
if ( event->button.button == 1 && !event_context->space_panning) {
Geom::OptRect const b = Inkscape::Rubberband::get(desktop)->getRectangle();
if (b && !within_tolerance) {
desktop->set_display_area(*b, 10);
} else if (!escaped) {
double const zoom_rel( (event->button.state & GDK_SHIFT_MASK)
? 1 / zoom_inc
: zoom_inc );
desktop->zoom_relative_keep_point(button_dt, zoom_rel);
}
ret = TRUE;
}
Inkscape::Rubberband::get(desktop)->stop();
if (zc->grabbed) {
sp_canvas_item_ungrab(zc->grabbed, event->button.time);
zc->grabbed = NULL;
}
xp = yp = 0;
escaped = false;
break;
}
case GDK_KEY_PRESS:
switch (get_group0_keyval (&event->key)) {
case GDK_Escape:
Inkscape::Rubberband::get(desktop)->stop();
xp = yp = 0;
escaped = true;
ret = TRUE;
break;
case GDK_Up:
//.........这里部分代码省略.........