#region Imports
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using DPumpHydr.WinFrmUI.RLT.Docking.Crown;
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using DPumpHydr.WinFrmUI.RLT.Enum.Crown;
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using System;
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using System.Drawing;
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using System.Windows.Forms;
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#endregion
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namespace DPumpHydr.WinFrmUI.RLT.Native
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{
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#region DockResizeFilterNative
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public class DockResizeFilter : IMessageFilter
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{
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#region Field Region
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private readonly CrownDockPanel _dockPanel;
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private readonly Timer _dragTimer;
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private bool _isDragging;
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private Point _initialContact;
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private CrownDockSplitter _activeSplitter;
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#endregion
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#region Constructor Region
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public DockResizeFilter(CrownDockPanel dockPanel)
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{
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_dockPanel = dockPanel;
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_dragTimer = new Timer
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{
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Interval = 1
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};
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_dragTimer.Tick += DragTimer_Tick;
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}
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#endregion
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#region IMessageFilter Region
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public bool PreFilterMessage(ref Message m)
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{
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// We only care about mouse events
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if (m.Msg is not (((int)WM.MOUSEMOVE) or ((int)WM.LBUTTONDOWN) or ((int)WM.LBUTTONUP) or ((int)WM.LBUTTONDBLCLK) or ((int)WM.RBUTTONDOWN) or ((int)WM.RBUTTONUP) or ((int)WM.RBUTTONDBLCLK)))
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{
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return false;
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}
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// Stop drag.
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if (m.Msg == (int)WM.LBUTTONUP)
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{
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if (_isDragging)
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{
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StopDrag();
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return true;
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}
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}
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// Exit out early if we're simply releasing a non-splitter drag over the area
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if (m.Msg == (int)WM.LBUTTONUP && !_isDragging)
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{
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return false;
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}
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// Force cursor if already dragging.
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if (_isDragging)
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{
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Cursor.Current = _activeSplitter.ResizeCursor;
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}
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// Return out early if we're dragging something that's not a splitter.
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if (m.Msg == (int)WM.MOUSEMOVE && !_isDragging && _dockPanel.MouseButtonState != MouseButtons.None)
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{
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return false;
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}
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// Try and create a control from the message handle.
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Control control = Control.FromHandle(m.HWnd);
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// Exit out if we didn't manage to create a control.
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if (control == null)
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{
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return false;
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}
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// Exit out if the control is not the dock panel or a child control.
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if (!(control == _dockPanel || _dockPanel.Contains(control)))
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{
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return false;
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}
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// Update the mouse cursor
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CheckCursor();
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// Start drag.
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if (m.Msg == (int)WM.LBUTTONDOWN)
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{
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CrownDockSplitter hotSplitter = HotSplitter();
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if (hotSplitter != null)
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{
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StartDrag(hotSplitter);
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return true;
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}
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}
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// Stop events passing through if we're hovering over a splitter
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if (HotSplitter() != null)
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{
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return true;
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}
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// Stop all events from going through if we're dragging a splitter.
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if (_isDragging)
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{
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return true;
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}
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return false;
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}
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#endregion
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#region Event Handler Region
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private void DragTimer_Tick(object sender, EventArgs e)
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{
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if (_dockPanel.MouseButtonState != MouseButtons.Left)
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{
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StopDrag();
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return;
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}
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Point difference = new(_initialContact.X - Cursor.Position.X, _initialContact.Y - Cursor.Position.Y);
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_activeSplitter.UpdateOverlay(difference);
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}
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#endregion
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#region Method Region
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private void StartDrag(CrownDockSplitter splitter)
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{
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_activeSplitter = splitter;
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Cursor.Current = _activeSplitter.ResizeCursor;
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_initialContact = Cursor.Position;
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_isDragging = true;
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_activeSplitter.ShowOverlay();
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_dragTimer.Start();
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}
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private void StopDrag()
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{
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_dragTimer.Stop();
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_activeSplitter.HideOverlay();
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Point difference = new(_initialContact.X - Cursor.Position.X, _initialContact.Y - Cursor.Position.Y);
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_activeSplitter.Move(difference);
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_isDragging = false;
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}
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private CrownDockSplitter HotSplitter()
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{
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foreach (CrownDockSplitter splitter in _dockPanel.Splitters)
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{
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if (splitter.Bounds.Contains(Cursor.Position))
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{
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return splitter;
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}
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}
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return null;
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}
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private void CheckCursor()
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{
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if (_isDragging)
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{
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return;
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}
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CrownDockSplitter hotSplitter = HotSplitter();
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if (hotSplitter != null)
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{
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Cursor.Current = hotSplitter.ResizeCursor;
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}
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}
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private void ResetCursor()
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{
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Cursor.Current = Cursors.Default;
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CheckCursor();
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}
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#endregion
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}
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#endregion
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}
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