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/** @file
* Selector component (click and rubberband)
*/
/* Authors:
* Krzysztof Kosiński <tweenk.pl@gmail.com>
* Jon A. Cruz <jon@joncruz.org>
*
* Copyright (C) 2009 Authors
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#include "control-point.h"
#include "desktop.h"
#include "desktop-handles.h"
#include "display/sodipodi-ctrlrect.h"
#include "ui/tools/tool-base.h"
#include "preferences.h"
#include "ui/tool/event-utils.h"
#include "ui/tool/selector.h"
#include <gdk/gdkkeysyms.h>
namespace Inkscape {
namespace UI {
/** A hidden control point used for rubberbanding and selection.
* It uses a clever hack: the canvas item is hidden and only receives events when they
* are passed to it using Selector's event() function. When left mouse button
* is pressed, it grabs events and handles drags and clicks in the usual way. */
class SelectorPoint : public ControlPoint {
public:
SelectorPoint(SPDesktop *d, SPCanvasGroup *group, Selector *s) :
ControlPoint(d, Geom::Point(0,0), SP_ANCHOR_CENTER,
CTRL_TYPE_INVISIPOINT,
invisible_cset, group),
_selector(s),
_cancel(false)
{
setVisible(false);
_rubber = static_cast<CtrlRect*>(sp_canvas_item_new(_desktop->getControls(),
SP_TYPE_CTRLRECT, NULL));
sp_canvas_item_hide(_rubber);
}
~SelectorPoint() {
sp_canvas_item_destroy(_rubber);
}
SPDesktop *desktop() { return _desktop; }
bool event(Inkscape::UI::Tools::ToolBase *ec, GdkEvent *e) {
return _eventHandler(ec, e);
}
protected:
virtual bool _eventHandler(Inkscape::UI::Tools::ToolBase *event_context, GdkEvent *event) {
if (event->type == GDK_KEY_PRESS && shortcut_key(event->key) == GDK_KEY_Escape &&
sp_canvas_item_is_visible(_rubber))
{
_cancel = true;
sp_canvas_item_hide(_rubber);
return true;
}
return ControlPoint::_eventHandler(event_context, event);
}
private:
virtual bool grabbed(GdkEventMotion *) {
_cancel = false;
_start = position();
sp_canvas_item_show(_rubber);
return false;
}
virtual void dragged(Geom::Point &new_pos, GdkEventMotion *) {
if (_cancel) return;
Geom::Rect sel(_start, new_pos);
_rubber->setRectangle(sel);
}
virtual void ungrabbed(GdkEventButton *event) {
if (_cancel) return;
sp_canvas_item_hide(_rubber);
Geom::Rect sel(_start, position());
_selector->signal_area.emit(sel, event);
}
virtual bool clicked(GdkEventButton *event) {
if (event->button != 1) return false;
_selector->signal_point.emit(position(), event);
return true;
}
CtrlRect *_rubber;
Selector *_selector;
Geom::Point _start;
bool _cancel;
};
Selector::Selector(SPDesktop *d)
: Manipulator(d)
, _dragger(new SelectorPoint(d, d->getControls(), this))
{
_dragger->setVisible(false);
}
Selector::~Selector()
{
delete _dragger;
}
bool Selector::event(Inkscape::UI::Tools::ToolBase *event_context, GdkEvent *event)
{
// The hidden control point will capture all events after it obtains the grab,
// but it relies on this function to initiate it. If we pass only first button
// press events here, it won't interfere with any other event handling.
switch (event->type) {
case GDK_BUTTON_PRESS:
// Do not pass button presses other than left button to the control point.
// This way middle click and right click can be handled in ToolBase.
if (event->button.button == 1 && !event_context->space_panning) {
_dragger->setPosition(_desktop->w2d(event_point(event->motion)));
return _dragger->event(event_context, event);
}
break;
default: break;
}
return false;
}
} // namespace UI
} // namespace Inkscape
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
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