#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 DPumpHydr.WinFrmUI.RLT.Forms;
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using System.Collections.Generic;
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using System.Drawing;
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using System.Windows.Forms;
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using static DPumpHydr.WinFrmUI.RLT.Helper.CrownHelper;
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#endregion
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namespace DPumpHydr.WinFrmUI.RLT.Native
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{
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#region DockContentDragFilterNative
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public class DockContentDragFilter : 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 CrownDockContent _dragContent;
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private readonly CrownTranslucentForm _highlightForm;
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private bool _isDragging = false;
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private CrownDockRegion _targetRegion;
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private CrownDockGroup _targetGroup;
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private DockInsertType _insertType = DockInsertType.None;
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private Dictionary<CrownDockRegion, DockDropArea> _regionDropAreas = new();
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private Dictionary<CrownDockGroup, DockDropCollection> _groupDropAreas = new();
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#endregion
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#region Constructor Region
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public DockContentDragFilter(CrownDockPanel dockPanel)
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{
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_dockPanel = dockPanel;
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_highlightForm = new CrownTranslucentForm(ThemeProvider.Theme.Colors.BlueSelection);
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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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// Exit out early if we're not dragging any content
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if (!_isDragging)
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{
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return false;
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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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// Move content
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if (m.Msg == (int)WM.MOUSEMOVE)
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{
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HandleDrag();
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return false;
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}
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// Drop content
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if (m.Msg == (int)WM.LBUTTONUP)
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{
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if (_targetRegion != null)
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{
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_dockPanel.RemoveContent(_dragContent);
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_dragContent.DockArea = _targetRegion.DockArea;
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_dockPanel.AddContent(_dragContent);
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}
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else if (_targetGroup != null)
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{
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_dockPanel.RemoveContent(_dragContent);
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switch (_insertType)
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{
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case DockInsertType.None:
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_dockPanel.AddContent(_dragContent, _targetGroup);
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break;
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case DockInsertType.Before:
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case DockInsertType.After:
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_dockPanel.InsertContent(_dragContent, _targetGroup, _insertType);
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break;
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}
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}
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StopDrag();
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return false;
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}
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return true;
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}
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#endregion
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#region Method Region
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public void StartDrag(CrownDockContent content)
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{
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_regionDropAreas = new Dictionary<CrownDockRegion, DockDropArea>();
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_groupDropAreas = new Dictionary<CrownDockGroup, DockDropCollection>();
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// Add all regions and groups to the drop collections
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foreach (CrownDockRegion region in _dockPanel.Regions.Values)
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{
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if (region.DockArea == DockArea.Document)
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{
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continue;
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}
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// If the region is visible then build drop areas for the groups.
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if (region.Visible)
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{
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foreach (CrownDockGroup group in region.Groups)
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{
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DockDropCollection collection = new(_dockPanel, group);
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_groupDropAreas.Add(group, collection);
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}
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}
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// If the region is NOT visible then build the drop area for the region itself.
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else
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{
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DockDropArea area = new(_dockPanel, region);
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_regionDropAreas.Add(region, area);
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}
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}
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_dragContent = content;
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_isDragging = true;
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}
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private void StopDrag()
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{
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Cursor.Current = Cursors.Default;
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_highlightForm.Hide();
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_dragContent = null;
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_isDragging = false;
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}
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private void UpdateHighlightForm(Rectangle rect)
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{
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Cursor.Current = Cursors.SizeAll;
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_highlightForm.SuspendLayout();
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_highlightForm.Size = new(rect.Width, rect.Height);
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_highlightForm.Location = new(rect.X, rect.Y);
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_highlightForm.ResumeLayout();
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if (!_highlightForm.Visible)
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{
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_highlightForm.Show();
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_highlightForm.BringToFront();
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}
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}
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private void HandleDrag()
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{
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Point location = Cursor.Position;
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_insertType = DockInsertType.None;
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_targetRegion = null;
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_targetGroup = null;
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// Check all region drop areas
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foreach (DockDropArea area in _regionDropAreas.Values)
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{
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if (area.DropArea.Contains(location))
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{
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_insertType = DockInsertType.None;
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_targetRegion = area.DockRegion;
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UpdateHighlightForm(area.HighlightArea);
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return;
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}
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}
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// Check all group drop areas
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foreach (DockDropCollection collection in _groupDropAreas.Values)
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{
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bool sameRegion = false;
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bool sameGroup = false;
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bool groupHasOtherContent = false;
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if (collection.DropArea.DockGroup == _dragContent.DockGroup)
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{
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sameGroup = true;
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}
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if (collection.DropArea.DockGroup.DockRegion == _dragContent.DockRegion)
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{
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sameRegion = true;
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}
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if (_dragContent.DockGroup.ContentCount > 1)
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{
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groupHasOtherContent = true;
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}
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// If we're hovering over the group itself, only allow inserting before/after if multiple content is tabbed.
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if (!sameGroup || groupHasOtherContent)
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{
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bool skipBefore = false;
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bool skipAfter = false;
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// Inserting before/after other content might cause the content to be dropped on to its own location.
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// Check if the group above/below the hovered group contains our drag content.
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if (sameRegion && !groupHasOtherContent)
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{
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if (collection.InsertBeforeArea.DockGroup.Order == _dragContent.DockGroup.Order + 1)
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{
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skipBefore = true;
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}
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if (collection.InsertAfterArea.DockGroup.Order == _dragContent.DockGroup.Order - 1)
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{
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skipAfter = true;
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}
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}
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if (!skipBefore)
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{
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if (collection.InsertBeforeArea.DropArea.Contains(location))
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{
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_insertType = DockInsertType.Before;
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_targetGroup = collection.InsertBeforeArea.DockGroup;
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UpdateHighlightForm(collection.InsertBeforeArea.HighlightArea);
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return;
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}
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}
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if (!skipAfter)
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{
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if (collection.InsertAfterArea.DropArea.Contains(location))
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{
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_insertType = DockInsertType.After;
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_targetGroup = collection.InsertAfterArea.DockGroup;
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UpdateHighlightForm(collection.InsertAfterArea.HighlightArea);
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return;
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}
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}
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}
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// Don't allow content to be dragged on to itself
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if (!sameGroup)
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{
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if (collection.DropArea.DropArea.Contains(location))
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{
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_insertType = DockInsertType.None;
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_targetGroup = collection.DropArea.DockGroup;
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UpdateHighlightForm(collection.DropArea.HighlightArea);
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return;
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}
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}
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}
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// Not hovering over anything - hide the highlight
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if (_highlightForm.Visible)
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{
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_highlightForm.Hide();
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}
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// Show we can't drag here
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Cursor.Current = Cursors.No;
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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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