/// <summary> /// Starts a drag operation. /// </summary> /// <param name="floatWindow">The <see cref="FloatWindow"/> to be dragged.</param> /// <param name="dockTabPane">The <see cref="DockTabPane"/> to be dragged.</param> /// <param name="dockTabItem">The <see cref="DockTabItem"/> to be dragged.</param> /// <returns> /// <see langword="true" /> if the drag operation has been started; otherwise, /// <see langword="false" /> if the drag operation could not be started (e.g. because the /// mouse could not be captured). /// </returns> private bool BeginDrag(FloatWindow floatWindow, DockTabPane dockTabPane, DockTabItem dockTabItem) { _dockStrategy = _dockControl.GetViewModel()?.DockStrategy; if (_dockStrategy == null || _dockStrategy.DockControl.IsLocked) { Reset(); return(false); } FrameworkElement element = null; IDockTabPane draggedPane = null; IDockTabItem draggedItem = null; if (floatWindow != null) { // User is dragging a FloatWindow. // (Note: Dragging of FloatWindows with nested layouts is not supported.) draggedPane = floatWindow.GetViewModel()?.RootPane as IDockTabPane; element = floatWindow; _floatWindow = floatWindow; _initialSize = floatWindow.RenderSize; // Start dragging immediately. _dragDeltaExceeded = true; } else if (dockTabItem != null) { // User is dragging a DockTabItem in a DockTabPanel. draggedItem = dockTabItem.GetViewModel(); element = dockTabItem; _targetDockTabPane = dockTabPane; _initialSize = dockTabPane.RenderSize; // Start dragging when threshold is exceeded. _initialMousePosition = WindowsHelper.GetMousePosition(_dockControl); _dragDeltaExceeded = false; } else if (dockTabPane != null) { // User is dragging a DockTabPane. draggedPane = dockTabPane.GetViewModel(); element = dockTabPane; _initialSize = dockTabPane.RenderSize; _initialMousePosition = WindowsHelper.GetMousePosition(_dockControl); // Start dragging when threshold is exceeded. _initialMousePosition = WindowsHelper.GetMousePosition(_dockControl); _dragDeltaExceeded = false; } if (draggedPane == null && draggedItem == null) { Reset(); return(false); } // When the user is dragging the FloatWindow, the mouse is captured by Win32 move window // loop. When dragging a DockTabPane or DockTabItem, the mouse needs to be // captured to receive mouse events. if (_floatWindow == null) { if (!_dockControl.CaptureMouse()) { // Failed to capture the mouse. Reset(); return(false); } _dockControl.LostMouseCapture += OnLostMouseCapture; _dockControl.MouseLeftButtonUp += OnMouseLeftButtonUp; _dockControl.MouseMove += OnMouseMove; _dockControl.PreviewKeyDown += OnPreviewKeyDown; if (_targetDockTabPane != null) { _targetDockTabPane.PreviewKeyDown += OnPreviewKeyDown; } } _dockStrategy.Begin(); if (draggedPane != null) { _dockStrategy.Activate(draggedPane); _activeItem = draggedPane.SelectedItem; foreach (var item in draggedPane.Items) { if (item.DockState == draggedPane.DockState) { _draggedItems.Add(item); } } } else { Debug.Assert(draggedItem != null); _dockStrategy.Activate(draggedItem); _activeItem = draggedItem; _draggedItems.Add(draggedItem); } Debug.Assert(_draggedItems.Count > 0); // Determine whether dragged items may end in a FloatWindow. _canFloat = CanFloat(); // Store the mouse offset relative to the dragged element. _mouseOffset = (Vector)WindowsHelper.GetMousePosition(element); // Remember information needed for a rollback. ReplaceItemsWithProxies(draggedPane ?? _targetDockTabPane.GetViewModel()); _originalDockState = _draggedItems[0].DockState; BackupFloatWindowPosition(); // Override mouse cursors. (Mouse cursor should not change to caret over text editor.) Mouse.OverrideCursor = Cursors.Arrow; return(true); }
private void DragDockTabItemsIntoFloatWindow() { Debug.Assert(_floatWindow == null); if (_targetDockTabPane != null) { ClearTranslateTransform(); _targetDockTabPane.PreviewKeyDown -= OnPreviewKeyDown; _targetDockTabPane = null; } _dockControl.LostMouseCapture -= OnLostMouseCapture; _dockControl.MouseLeftButtonUp -= OnMouseLeftButtonUp; _dockControl.MouseMove -= OnMouseMove; _dockControl.PreviewKeyDown -= OnPreviewKeyDown; _dockControl.ReleaseMouseCapture(); // Remove the dragged items from their current location. foreach (var item in _draggedItems) { DockHelper.Remove(_dockStrategy.DockControl.RootPane, item); foreach (var floatWindow in _dockStrategy.DockControl.FloatWindows) { DockHelper.Remove(floatWindow, item); } DockHelper.Remove(_dockStrategy.DockControl.AutoHideLeft, item); DockHelper.Remove(_dockStrategy.DockControl.AutoHideRight, item); DockHelper.Remove(_dockStrategy.DockControl.AutoHideTop, item); DockHelper.Remove(_dockStrategy.DockControl.AutoHideBottom, item); } // Move items into a new FloatWindow. foreach (var item in _draggedItems) { item.DockState = DockState.Float; } var newPaneVM = _dockStrategy.CreateDockTabPane(_draggedItems[0], DockState.Float); for (int i = 1; i < _draggedItems.Count; i++) { newPaneVM.Items.Add(_draggedItems[i]); } var floatWindowVM = _dockStrategy.CreateFloatWindow(); floatWindowVM.RootPane = newPaneVM; _dockStrategy.DockControl.FloatWindows.Add(floatWindowVM); _dockStrategy.Activate(_activeItem); _dockStrategy.Cleanup(); // Get the newly created FloatWindow (view) from the DockControl. _floatWindow = GetFloatWindow(floatWindowVM); Debug.Assert(_floatWindow != null); LimitFloatWindowSize(_floatWindow, _initialSize); // Limit mouse offset to FloatWindow size. double actualWidth = _floatWindow.ActualWidth; if (actualWidth > 0) { _mouseOffset.X = Math.Min(_mouseOffset.X, actualWidth / 2); } Point position = GetFloatWindowPosition(); _floatWindow.Left = position.X; _floatWindow.Top = position.Y; // Wait until FloatWindow is loaded, initiate the Win32 move window loop. _floatWindow.Dispatcher.BeginInvoke(new Action(() => { if (_floatWindow != null) { LimitFloatWindowSize(_floatWindow, _initialSize); // Limit mouse offset to FloatWindow size. _mouseOffset.X = Math.Min(_mouseOffset.X, _floatWindow.ActualWidth / 2); _mouseOffset.Y = Math.Max(_mouseOffset.Y, 8); Point pos = GetFloatWindowPosition(); _floatWindow.Left = pos.X; _floatWindow.Top = pos.Y; if (Mouse.LeftButton == MouseButtonState.Pressed) { _floatWindow.DragMove(); } else { EndDrag(true); } } }), DispatcherPriority.Loaded); // Important: Action needs to be invoked before input. }
/// <summary> /// Starts a drag operation. /// </summary> /// <param name="floatWindow">The <see cref="FloatWindow"/> to be dragged.</param> /// <param name="dockTabPane">The <see cref="DockTabPane"/> to be dragged.</param> /// <param name="dockTabItem">The <see cref="DockTabItem"/> to be dragged.</param> /// <returns> /// <see langword="true" /> if the drag operation has been started; otherwise, /// <see langword="false" /> if the drag operation could not be started (e.g. because the /// mouse could not be captured). /// </returns> private bool BeginDrag(FloatWindow floatWindow, DockTabPane dockTabPane, DockTabItem dockTabItem) { _dockStrategy = _dockControl.GetViewModel()?.DockStrategy; if (_dockStrategy == null || _dockStrategy.DockControl.IsLocked) { Reset(); return false; } FrameworkElement element = null; IDockTabPane draggedPane = null; IDockTabItem draggedItem = null; if (floatWindow != null) { // User is dragging a FloatWindow. // (Note: Dragging of FloatWindows with nested layouts is not supported.) draggedPane = floatWindow.GetViewModel()?.RootPane as IDockTabPane; element = floatWindow; _floatWindow = floatWindow; _initialSize = floatWindow.RenderSize; // Start dragging immediately. _dragDeltaExceeded = true; } else if (dockTabItem != null) { // User is dragging a DockTabItem in a DockTabPanel. draggedItem = dockTabItem.GetViewModel(); element = dockTabItem; _targetDockTabPane = dockTabPane; _initialSize = dockTabPane.RenderSize; // Start dragging when threshold is exceeded. _initialMousePosition = WindowsHelper.GetMousePosition(_dockControl); _dragDeltaExceeded = false; } else if (dockTabPane != null) { // User is dragging a DockTabPane. draggedPane = dockTabPane.GetViewModel(); element = dockTabPane; _initialSize = dockTabPane.RenderSize; _initialMousePosition = WindowsHelper.GetMousePosition(_dockControl); // Start dragging when threshold is exceeded. _initialMousePosition = WindowsHelper.GetMousePosition(_dockControl); _dragDeltaExceeded = false; } if (draggedPane == null && draggedItem == null) { Reset(); return false; } // When the user is dragging the FloatWindow, the mouse is captured by Win32 move window // loop. When dragging a DockTabPane or DockTabItem, the mouse needs to be // captured to receive mouse events. if (_floatWindow == null) { if (!_dockControl.CaptureMouse()) { // Failed to capture the mouse. Reset(); return false; } _dockControl.LostMouseCapture += OnLostMouseCapture; _dockControl.MouseLeftButtonUp += OnMouseLeftButtonUp; _dockControl.MouseMove += OnMouseMove; _dockControl.PreviewKeyDown += OnPreviewKeyDown; if (_targetDockTabPane != null) _targetDockTabPane.PreviewKeyDown += OnPreviewKeyDown; } _dockStrategy.Begin(); if (draggedPane != null) { _dockStrategy.Activate(draggedPane); _activeItem = draggedPane.SelectedItem; foreach (var item in draggedPane.Items) if (item.DockState == draggedPane.DockState) _draggedItems.Add(item); } else { Debug.Assert(draggedItem != null); _dockStrategy.Activate(draggedItem); _activeItem = draggedItem; _draggedItems.Add(draggedItem); } Debug.Assert(_draggedItems.Count > 0); // Determine whether dragged items may end in a FloatWindow. _canFloat = CanFloat(); // Store the mouse offset relative to the dragged element. _mouseOffset = (Vector)WindowsHelper.GetMousePosition(element); // Remember information needed for a rollback. ReplaceItemsWithProxies(draggedPane ?? _targetDockTabPane.GetViewModel()); _originalDockState = _draggedItems[0].DockState; BackupFloatWindowPosition(); // Override mouse cursors. (Mouse cursor should not change to caret over text editor.) Mouse.OverrideCursor = Cursors.Arrow; return true; }