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Handle mouse events that go outside the view / canvas, by only installing mousedown events on view and all others on document.

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This commit is contained in:
Jürg Lehni 2011-06-21 00:38:11 +01:00
parent 8361f513ed
commit 8a285a7baa
1 changed files with 90 additions and 67 deletions
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157
src/ui/View.js
View file

@ -369,73 +369,96 @@ var View = this.View = Base.extend({
*
* @type function
*/
onResize: null,
onResize: null
}, new function() { // Injection scope for mouse handlers
var view,
tool,
timer,
curPoint,
dragging = false;
_createEvents: function() {
var that = this,
tool,
timer,
curPoint,
dragging = false;
function viewToArtwork(event) {
return that.viewToArtwork(DomEvent.getOffset(event));
}
function mousedown(event) {
// Tell the Key class which view should receive keyboard input.
View.focused = that;
if (!(tool = that._scope.tool))
return;
curPoint = viewToArtwork(event);
if (tool.onHandleEvent('mousedown', curPoint, event))
that.draw(true);
if (tool.eventInterval != null)
timer = setInterval(mousemove, tool.eventInterval);
dragging = true;
}
function mousemove(event) {
if (!(tool = that._scope.tool))
return;
// If the event was triggered by a touch screen device, prevent the
// default behaviour, as it will otherwise scroll the page:
if (event && event.targetTouches)
DomEvent.preventDefault(event);
var point = event && viewToArtwork(event);
var onlyMove = !!(!tool.onMouseDrag && tool.onMouseMove);
if (dragging && !onlyMove) {
curPoint = point || curPoint;
if (curPoint && tool.onHandleEvent('mousedrag', curPoint, event))
that.draw(true);
// PORT: If there is only an onMouseMove handler, also call it when
// the user is dragging:
} else if (!dragging || onlyMove) {
if (tool.onHandleEvent('mousemove', point, event))
that.draw(true);
}
}
function mouseup(event) {
if (!dragging)
return;
dragging = false;
curPoint = null;
if (tool) {
if (tool.eventInterval != null)
timer = clearInterval(timer);
if (tool.onHandleEvent('mouseup', viewToArtwork(event), event))
that.draw(true);
}
}
return {
mousedown: mousedown,
mousemove: mousemove,
mouseup: mouseup,
touchstart: mousedown,
touchmove: mousemove,
touchend: mouseup
};
function viewToArtwork(event) {
return view.viewToArtwork(DomEvent.getOffset(event, view._canvas));
}
function mousemove(event) {
DomEvent.stop(event);
if (!view || !(tool = view._scope.tool))
return;
// If the event was triggered by a touch screen device, prevent the
// default behaviour, as it will otherwise scroll the page:
if (event && event.targetTouches)
DomEvent.preventDefault(event);
var point = event && viewToArtwork(event);
var onlyMove = !!(!tool.onMouseDrag && tool.onMouseMove);
if (dragging && !onlyMove) {
curPoint = point || curPoint;
if (curPoint && tool.onHandleEvent('mousedrag', curPoint, event))
view.draw(true);
// PORT: If there is only an onMouseMove handler, also call it when
// the user is dragging:
} else if ((!dragging || onlyMove)
&& tool.onHandleEvent('mousemove', point, event)) {
view.draw(true);
}
}
function mouseup(event) {
if (!view || !dragging)
return;
dragging = false;
curPoint = null;
if (tool) {
if (timer != null)
timer = clearInterval(timer);
if (tool.onHandleEvent('mouseup', viewToArtwork(event), event))
view.draw(true);
DomEvent.stop(event);
}
}
function selectstart(event) {
// Only stop this even if we're dragging already, since otherwise no
// text whatsoever can be selected on the page.
if (dragging)
DomEvent.stop(event);
}
// mousemove and mouseup events need to be installed on document, not the
// view canvas, since we want to catch the end of drag events even outside
// our view. Only the mousedown events are installed on the view, as handled
// by _createEvents below.
DomEvent.add(document, {
mousemove: mousemove,
mouseup: mouseup,
touchmove: mousemove,
touchend: mouseup,
selectstart: selectstart
});
return {
_createEvents: function() {
var that = this;
function mousedown(event) {
// Tell the Key class which view should receive keyboard input.
view = View.focused = that;
if (!(tool = view._scope.tool))
return;
curPoint = viewToArtwork(event);
if (tool.onHandleEvent('mousedown', curPoint, event))
view.draw(true);
if (tool.eventInterval != null)
timer = setInterval(mousemove, tool.eventInterval);
dragging = true;
}
return {
mousedown: mousedown,
touchstart: mousedown,
selectstart: selectstart
};
}
};
});