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Add drag-drop support. #359

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merged 1 commit into from Jun 11, 2023
Merged

Add drag-drop support. #359

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46 changes: 37 additions & 9 deletions lib/src/display/stage.dart
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Expand Up @@ -138,6 +138,28 @@ class Stage extends DisplayObjectContainer {

EventStream<Event> get onMouseLeave => Stage.mouseLeaveEvent.forTarget(this);

/// Dispatched when an external HTML element was dragged entering the stage
/// canvas.
EventStream<MouseEvent> get onDragEnter =>
const EventStreamProvider<MouseEvent>(MouseEvent.DRAG_ENTER)
.forTarget(this);

/// Dispatched when an external HTML element was dragged leaving the stage
/// canvas.
EventStream<MouseEvent> get onDragLeave =>
const EventStreamProvider<MouseEvent>(MouseEvent.DRAG_LEAVE)
.forTarget(this);

/// Dispatched when an external HTML element was dragged over the stage
/// canvas.
EventStream<MouseEvent> get onDragOver =>
const EventStreamProvider<MouseEvent>(MouseEvent.DRAG_OVER)
.forTarget(this);

/// Dispatched when an external HTML element was dropped on stage canvas.
EventStream<MouseEvent> get onDrop =>
const EventStreamProvider<MouseEvent>(MouseEvent.DROP).forTarget(this);

//----------------------------------------------------------------------------

Stage(CanvasElement canvas,
Expand Down Expand Up @@ -183,6 +205,10 @@ class Stage extends DisplayObjectContainer {
canvas.onMouseOut.listen(_onMouseEvent);
canvas.onContextMenu.listen(_onMouseEvent);
canvas.onMouseWheel.listen(_onMouseWheelEvent);
canvas.onDragEnter.listen(_onMouseEvent);
canvas.onDragLeave.listen(_onMouseEvent);
canvas.onDragOver.listen(_onMouseEvent);
canvas.onDrop.listen(_onMouseEvent);
}

final listenToTouchEvents = _inputEventMode == InputEventMode.TouchOnly ||
Expand Down Expand Up @@ -759,23 +785,25 @@ class Stage extends DisplayObjectContainer {
mouseButton.target = target;
mouseButton.clickTime = time;
mouseButton.clickCount++;
}

if (event.type == 'mouseup') {
} else if (event.type == 'mouseup') {
mouseEventType = mouseButton.mouseUpEventType;
mouseButton.buttonDown = false;
isClick = mouseButton.target == target;
isDoubleClick = isClick &&
mouseButton.clickCount.isEven &&
(time < mouseButton.clickTime + 500);
}

if (event.type == 'mousemove') {
} else if (event.type == 'mousemove') {
mouseEventType = MouseEvent.MOUSE_MOVE;
}

if (event.type == 'contextmenu') {
} else if (event.type == 'contextmenu') {
mouseEventType = MouseEvent.CONTEXT_MENU;
} else if (event.type == 'dragenter') {
mouseEventType = MouseEvent.DRAG_ENTER;
} else if (event.type == 'dragleave') {
mouseEventType = MouseEvent.DRAG_LEAVE;
} else if (event.type == 'dragover') {
mouseEventType = MouseEvent.DRAG_OVER;
} else if (event.type == 'drop') {
mouseEventType = MouseEvent.DROP;
}

//-----------------------------------------------------------------
Expand Down
5 changes: 5 additions & 0 deletions lib/src/events/mouse_event.dart
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Expand Up @@ -34,6 +34,11 @@ class MouseEvent extends InputEvent {
static const String ROLL_OUT = 'rollOut';
static const String ROLL_OVER = 'rollOver';

static const String DRAG_ENTER = 'dragEnter';
static const String DRAG_LEAVE = 'dragLeave';
static const String DRAG_OVER = 'dragOver';
static const String DROP = 'drop';

//---------------------------------------------------------------------------

/// The amount that is expected to scroll horizontally.
Expand Down