Add API to programmatically initiate a drag
For some use cases we have other behavior on mouse press and want to manually control when a drag starts. Split out the drag initiation code into startDrag.
This commit is contained in:
Colin Walters
parent
3e54087e42
commit
1a834f7d8b
148
js/ui/dnd.js
148
js/ui/dnd.js
@ -8,15 +8,17 @@ const Tweener = imports.ui.tweener;
|
||||
|
||||
const SNAP_BACK_ANIMATION_TIME = 0.25;
|
||||
|
||||
function _Draggable(actor) {
|
||||
this._init(actor);
|
||||
function _Draggable(actor, manualMode) {
|
||||
this._init(actor, manualMode);
|
||||
}
|
||||
|
||||
_Draggable.prototype = {
|
||||
_init : function(actor) {
|
||||
_init : function(actor, manualMode) {
|
||||
this.actor = actor;
|
||||
this.actor.connect('button-press-event',
|
||||
Lang.bind(this, this._onButtonPress));
|
||||
if (!manualMode)
|
||||
this.actor.connect('button-press-event',
|
||||
Lang.bind(this, this._onButtonPress));
|
||||
this._haveSourceGrab = false;
|
||||
},
|
||||
|
||||
_onButtonPress : function (actor, event) {
|
||||
@ -25,6 +27,7 @@ _Draggable.prototype = {
|
||||
if (Tweener.getTweenCount(actor))
|
||||
return false;
|
||||
|
||||
this._haveSourceGrab = true;
|
||||
this._grabActor(actor);
|
||||
|
||||
let [stageX, stageY] = event.get_coords();
|
||||
@ -66,6 +69,80 @@ _Draggable.prototype = {
|
||||
return false;
|
||||
},
|
||||
|
||||
/**
|
||||
* startDrag:
|
||||
* @actor: Origin actor for drag and drop
|
||||
* @stageX: X coordinate of event
|
||||
* @stageY: Y coordinate of event
|
||||
* @time: Event timestamp
|
||||
*
|
||||
* Directly initiate a drag and drop operation from the given actor.
|
||||
* This function is useful to call if you've specified manualMode
|
||||
* for the draggable.
|
||||
*/
|
||||
startDrag: function (actor, stageX, stageY, time) {
|
||||
this.emit('drag-begin', time);
|
||||
|
||||
this._dragStartX = stageX;
|
||||
this._dragStartY = stageY;
|
||||
|
||||
if (this.actor._delegate && this.actor._delegate.getDragActor) {
|
||||
this._dragActor = this.actor._delegate.getDragActor(this._dragStartX, this._dragStartY);
|
||||
// Drag actor does not always have to be the same as actor. For example drag actor
|
||||
// can be an image that's part of the actor. So to perform "snap back" correctly we need
|
||||
// to know what was the drag actor source.
|
||||
if (this.actor._delegate.getDragActorSource) {
|
||||
this._dragActorSource = this.actor._delegate.getDragActorSource();
|
||||
// If the user dragged from the source, then position
|
||||
// the dragActor over it. Otherwise, center it
|
||||
// around the pointer
|
||||
let [sourceX, sourceY] = this._dragActorSource.get_transformed_position();
|
||||
let [sourceWidth, sourceHeight] = this._dragActorSource.get_transformed_size();
|
||||
let x, y;
|
||||
if (stageX > sourceX && stageX <= sourceX + sourceWidth &&
|
||||
stageY > sourceY && stageY <= sourceY + sourceHeight) {
|
||||
x = sourceX;
|
||||
y = sourceY;
|
||||
} else {
|
||||
x = stageX - this._dragActor.width / 2;
|
||||
y = stageY - this._dragActor.height / 2;
|
||||
}
|
||||
this._dragActor.set_position(x, y);
|
||||
} else {
|
||||
this._dragActorSource = this.actor;
|
||||
}
|
||||
this._dragOrigParent = undefined;
|
||||
if (this._haveSourceGrab) {
|
||||
this._haveSourceGrab = false;
|
||||
this._ungrabActor(actor);
|
||||
}
|
||||
this._grabActor(this._dragActor);
|
||||
|
||||
this._dragOffsetX = this._dragActor.x - this._dragStartX;
|
||||
this._dragOffsetY = this._dragActor.y - this._dragStartY;
|
||||
} else {
|
||||
this._dragActor = actor;
|
||||
this._dragActorSource = undefined;
|
||||
this._dragOrigParent = actor.get_parent();
|
||||
this._dragOrigX = this._dragActor.x;
|
||||
this._dragOrigY = this._dragActor.y;
|
||||
this._dragOrigScale = this._dragActor.scale_x;
|
||||
|
||||
let [actorStageX, actorStageY] = actor.get_transformed_position();
|
||||
this._dragOffsetX = actorStageX - this._dragStartX;
|
||||
this._dragOffsetY = actorStageY - this._dragStartY;
|
||||
|
||||
// Set the actor's scale such that it will keep the same
|
||||
// transformed size when it's reparented to the stage
|
||||
let [scaledWidth, scaledHeight] = actor.get_transformed_size();
|
||||
actor.set_scale(scaledWidth / actor.width,
|
||||
scaledHeight / actor.height);
|
||||
}
|
||||
|
||||
this._dragActor.reparent(actor.get_stage());
|
||||
this._dragActor.raise_top();
|
||||
},
|
||||
|
||||
_onMotion : function (actor, event) {
|
||||
let [stageX, stageY] = event.get_coords();
|
||||
|
||||
@ -75,55 +152,7 @@ _Draggable.prototype = {
|
||||
if (!this._dragActor &&
|
||||
(Math.abs(stageX - this._dragStartX) > threshold ||
|
||||
Math.abs(stageY - this._dragStartY) > threshold)) {
|
||||
this.emit('drag-begin', event.get_time());
|
||||
|
||||
if (this.actor._delegate && this.actor._delegate.getDragActor) {
|
||||
this._dragActor = this.actor._delegate.getDragActor(this._dragStartX, this._dragStartY);
|
||||
// Drag actor does not always have to be the same as actor. For example drag actor
|
||||
// can be an image that's part of the actor. So to perform "snap back" correctly we need
|
||||
// to know what was the drag actor source.
|
||||
if (this.actor._delegate.getDragActorSource) {
|
||||
this._dragActorSource = this.actor._delegate.getDragActorSource();
|
||||
// If the user dragged from the source, then position
|
||||
// the dragActor over it. Otherwise, center it
|
||||
// around the pointer
|
||||
let [sourceX, sourceY] = this._dragActorSource.get_transformed_position();
|
||||
let [sourceWidth, sourceHeight] = this._dragActorSource.get_transformed_size();
|
||||
if (stageX > sourceX && stageX <= sourceX + sourceWidth &&
|
||||
stageY > sourceY && stageY <= sourceY + sourceHeight)
|
||||
this._dragActor.set_position(sourceX, sourceY);
|
||||
else
|
||||
this._dragActor.set_position(stageX - this._dragActor.width / 2, stageY - this._dragActor.height / 2);
|
||||
} else {
|
||||
this._dragActorSource = this.actor;
|
||||
}
|
||||
this._dragOrigParent = undefined;
|
||||
this._ungrabActor(actor);
|
||||
this._grabActor(this._dragActor);
|
||||
|
||||
this._dragOffsetX = this._dragActor.x - this._dragStartX;
|
||||
this._dragOffsetY = this._dragActor.y - this._dragStartY;
|
||||
} else {
|
||||
this._dragActor = actor;
|
||||
this._dragActorSource = undefined;
|
||||
this._dragOrigParent = actor.get_parent();
|
||||
this._dragOrigX = this._dragActor.x;
|
||||
this._dragOrigY = this._dragActor.y;
|
||||
this._dragOrigScale = this._dragActor.scale_x;
|
||||
|
||||
let [actorStageX, actorStageY] = actor.get_transformed_position();
|
||||
this._dragOffsetX = actorStageX - this._dragStartX;
|
||||
this._dragOffsetY = actorStageY - this._dragStartY;
|
||||
|
||||
// Set the actor's scale such that it will keep the same
|
||||
// transformed size when it's reparented to the stage
|
||||
let [scaledWidth, scaledHeight] = actor.get_transformed_size();
|
||||
actor.set_scale(scaledWidth / actor.width,
|
||||
scaledHeight / actor.height);
|
||||
}
|
||||
|
||||
this._dragActor.reparent(actor.get_stage());
|
||||
this._dragActor.raise_top();
|
||||
this.startDrag(actor, stageX, stageY, event.get_time());
|
||||
}
|
||||
|
||||
// If we are dragging, update the position
|
||||
@ -225,6 +254,13 @@ _Draggable.prototype = {
|
||||
|
||||
Signals.addSignalMethods(_Draggable.prototype);
|
||||
|
||||
function makeDraggable(actor) {
|
||||
return new _Draggable(actor);
|
||||
/**
|
||||
* makeDraggable:
|
||||
* @actor: Source actor
|
||||
* @manualMode: If given, do not automatically start drag and drop on click
|
||||
*
|
||||
* Create an object which controls drag and drop for the given actor.
|
||||
*/
|
||||
function makeDraggable(actor, manualMode) {
|
||||
return new _Draggable(actor, manualMode);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user