Method startDrag

src/manager/msDndManager.ts:143–178

(msWindow: MsWindow)

    }

    startDrag(msWindow: MsWindow) {
        global.stage.add_child(this.inputGrabber);
        const originalParent = assertNotNull(msWindow.get_parent());
        msWindow.freezeAllocation();
        this.msWindowManager.msWindowList.forEach((aMsWindow) => {
            aMsWindow.updateMetaWindowVisibility();
        });
        const [globalX, globalY] = global.get_pointer();
        const [_, relativeX, relativeY] = msWindow.transform_stage_point(
            globalX,
            globalY
        );

        this.dragInProgress = {
            msWindow,
            originPointerAnchor: [
                relativeX! / msWindow.width,
                relativeY! / msWindow.height,
            ],
            originalParent,
        };
        Me.layout!.setActorAbove(msWindow);
        this.checkUnderThePointerRoutine();
        msWindow.set_position(
            Math.round(
                globalX -
                    msWindow.width * this.dragInProgress.originPointerAnchor[0]
            ),
            Math.round(
                globalY -
                    msWindow.height * this.dragInProgress.originPointerAnchor[1]
            )
        );
        this.msWindowManager.msFocusManager.pushModal(this.inputGrabber);
        Me.msThemeManager!.setCursor(Meta.Cursor.DND_IN_DRAG);
    }

    endDrag() {
        assert(this.dragInProgress !== null, 'No drag in progress');