source: trunk/sources/HeuristicLab.ExtLibs/HeuristicLab.WinFormsUI/2.3.1/WinFormsUI-2.3.1/Docking/AutoHideStripBase.cs @ 5405

using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;

namespace WeifenLuo.WinFormsUI.Docking {
  public abstract partial class AutoHideStripBase : Control {
    [SuppressMessage("Microsoft.Design", "CA1034:NestedTypesShouldNotBeVisible")]
    protected class Tab : IDisposable {
      private IDockContent m_content;

      protected internal Tab(IDockContent content) {
        m_content = content;
      }

      ~Tab() {
        Dispose(false);
      }

      public IDockContent Content {
        get { return m_content; }
      }

      public void Dispose() {
        Dispose(true);
        GC.SuppressFinalize(this);
      }

      protected virtual void Dispose(bool disposing) {
      }
    }

    [SuppressMessage("Microsoft.Design", "CA1034:NestedTypesShouldNotBeVisible")]
    protected sealed class TabCollection : IEnumerable<Tab> {
      #region IEnumerable Members
      IEnumerator<Tab> IEnumerable<Tab>.GetEnumerator() {
        for (int i = 0; i < Count; i++)
          yield return this[i];
      }

      IEnumerator IEnumerable.GetEnumerator() {
        for (int i = 0; i < Count; i++)
          yield return this[i];
      }
      #endregion

      internal TabCollection(DockPane pane) {
        m_dockPane = pane;
      }

      private DockPane m_dockPane = null;
      public DockPane DockPane {
        get { return m_dockPane; }
      }

      public DockPanel DockPanel {
        get { return DockPane.DockPanel; }
      }

      public int Count {
        get { return DockPane.DisplayingContents.Count; }
      }

      public Tab this[int index] {
        get {
          IDockContent content = DockPane.DisplayingContents[index];
          if (content == null)
            throw (new ArgumentOutOfRangeException("index"));
          if (content.DockHandler.AutoHideTab == null)
            content.DockHandler.AutoHideTab = (DockPanel.AutoHideStripControl.CreateTab(content));
          return content.DockHandler.AutoHideTab as Tab;
        }
      }

      public bool Contains(Tab tab) {
        return (IndexOf(tab) != -1);
      }

      public bool Contains(IDockContent content) {
        return (IndexOf(content) != -1);
      }

      public int IndexOf(Tab tab) {
        if (tab == null)
          return -1;

        return IndexOf(tab.Content);
      }

      public int IndexOf(IDockContent content) {
        return DockPane.DisplayingContents.IndexOf(content);
      }
    }

    [SuppressMessage("Microsoft.Design", "CA1034:NestedTypesShouldNotBeVisible")]
    protected class Pane : IDisposable {
      private DockPane m_dockPane;

      protected internal Pane(DockPane dockPane) {
        m_dockPane = dockPane;
      }

      ~Pane() {
        Dispose(false);
      }

      public DockPane DockPane {
        get { return m_dockPane; }
      }

      public TabCollection AutoHideTabs {
        get {
          if (DockPane.AutoHideTabs == null)
            DockPane.AutoHideTabs = new TabCollection(DockPane);
          return DockPane.AutoHideTabs as TabCollection;
        }
      }

      public void Dispose() {
        Dispose(true);
        GC.SuppressFinalize(this);
      }

      protected virtual void Dispose(bool disposing) {
      }
    }

    [SuppressMessage("Microsoft.Design", "CA1034:NestedTypesShouldNotBeVisible")]
    protected sealed class PaneCollection : IEnumerable<Pane> {
      private class AutoHideState {
        public DockState m_dockState;
        public bool m_selected = false;

        public AutoHideState(DockState dockState) {
          m_dockState = dockState;
        }

        public DockState DockState {
          get { return m_dockState; }
        }

        public bool Selected {
          get { return m_selected; }
          set { m_selected = value; }
        }
      }

      private class AutoHideStateCollection {
        private AutoHideState[] m_states;

        public AutoHideStateCollection() {
          m_states = new AutoHideState[]  { 
                        new AutoHideState(DockState.DockTopAutoHide),
                        new AutoHideState(DockState.DockBottomAutoHide),
                        new AutoHideState(DockState.DockLeftAutoHide),
                        new AutoHideState(DockState.DockRightAutoHide)
                      };
        }

        public AutoHideState this[DockState dockState] {
          get {
            for (int i = 0; i < m_states.Length; i++) {
              if (m_states[i].DockState == dockState)
                return m_states[i];
            }
            throw new ArgumentOutOfRangeException("dockState");
          }
        }

        public bool ContainsPane(DockPane pane) {
          if (pane.IsHidden)
            return false;

          for (int i = 0; i < m_states.Length; i++) {
            if (m_states[i].DockState == pane.DockState && m_states[i].Selected)
              return true;
          }
          return false;
        }
      }

      internal PaneCollection(DockPanel panel, DockState dockState) {
        m_dockPanel = panel;
        m_states = new AutoHideStateCollection();
        States[DockState.DockTopAutoHide].Selected = (dockState == DockState.DockTopAutoHide);
        States[DockState.DockBottomAutoHide].Selected = (dockState == DockState.DockBottomAutoHide);
        States[DockState.DockLeftAutoHide].Selected = (dockState == DockState.DockLeftAutoHide);
        States[DockState.DockRightAutoHide].Selected = (dockState == DockState.DockRightAutoHide);
      }

      private DockPanel m_dockPanel;
      public DockPanel DockPanel {
        get { return m_dockPanel; }
      }

      private AutoHideStateCollection m_states;
      private AutoHideStateCollection States {
        get { return m_states; }
      }

      public int Count {
        get {
          int count = 0;
          foreach (DockPane pane in DockPanel.Panes) {
            if (States.ContainsPane(pane))
              count++;
          }

          return count;
        }
      }

      public Pane this[int index] {
        get {
          int count = 0;
          foreach (DockPane pane in DockPanel.Panes) {
            if (!States.ContainsPane(pane))
              continue;

            if (count == index) {
              if (pane.AutoHidePane == null)
                pane.AutoHidePane = DockPanel.AutoHideStripControl.CreatePane(pane);
              return pane.AutoHidePane as Pane;
            }

            count++;
          }
          throw new ArgumentOutOfRangeException("index");
        }
      }

      public bool Contains(Pane pane) {
        return (IndexOf(pane) != -1);
      }

      public int IndexOf(Pane pane) {
        if (pane == null)
          return -1;

        int index = 0;
        foreach (DockPane dockPane in DockPanel.Panes) {
          if (!States.ContainsPane(pane.DockPane))
            continue;

          if (pane == dockPane.AutoHidePane)
            return index;

          index++;
        }
        return -1;
      }

      #region IEnumerable Members

      IEnumerator<Pane> IEnumerable<Pane>.GetEnumerator() {
        for (int i = 0; i < Count; i++)
          yield return this[i];
      }

      IEnumerator IEnumerable.GetEnumerator() {
        for (int i = 0; i < Count; i++)
          yield return this[i];
      }

      #endregion
    }

    protected AutoHideStripBase(DockPanel panel) {
      m_dockPanel = panel;
      m_panesTop = new PaneCollection(panel, DockState.DockTopAutoHide);
      m_panesBottom = new PaneCollection(panel, DockState.DockBottomAutoHide);
      m_panesLeft = new PaneCollection(panel, DockState.DockLeftAutoHide);
      m_panesRight = new PaneCollection(panel, DockState.DockRightAutoHide);

      SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
      SetStyle(ControlStyles.Selectable, false);
    }

    private DockPanel m_dockPanel;
    protected DockPanel DockPanel {
      get { return m_dockPanel; }
    }

    private PaneCollection m_panesTop;
    protected PaneCollection PanesTop {
      get { return m_panesTop; }
    }

    private PaneCollection m_panesBottom;
    protected PaneCollection PanesBottom {
      get { return m_panesBottom; }
    }

    private PaneCollection m_panesLeft;
    protected PaneCollection PanesLeft {
      get { return m_panesLeft; }
    }

    private PaneCollection m_panesRight;
    protected PaneCollection PanesRight {
      get { return m_panesRight; }
    }

    protected PaneCollection GetPanes(DockState dockState) {
      if (dockState == DockState.DockTopAutoHide)
        return PanesTop;
      else if (dockState == DockState.DockBottomAutoHide)
        return PanesBottom;
      else if (dockState == DockState.DockLeftAutoHide)
        return PanesLeft;
      else if (dockState == DockState.DockRightAutoHide)
        return PanesRight;
      else
        throw new ArgumentOutOfRangeException("dockState");
    }

    internal int GetNumberOfPanes(DockState dockState) {
      return GetPanes(dockState).Count;
    }

    protected Rectangle RectangleTopLeft {
      get {
        int height = MeasureHeight();
        return PanesTop.Count > 0 && PanesLeft.Count > 0 ? new Rectangle(0, 0, height, height) : Rectangle.Empty;
      }
    }

    protected Rectangle RectangleTopRight {
      get {
        int height = MeasureHeight();
        return PanesTop.Count > 0 && PanesRight.Count > 0 ? new Rectangle(Width - height, 0, height, height) : Rectangle.Empty;
      }
    }

    protected Rectangle RectangleBottomLeft {
      get {
        int height = MeasureHeight();
        return PanesBottom.Count > 0 && PanesLeft.Count > 0 ? new Rectangle(0, Height - height, height, height) : Rectangle.Empty;
      }
    }

    protected Rectangle RectangleBottomRight {
      get {
        int height = MeasureHeight();
        return PanesBottom.Count > 0 && PanesRight.Count > 0 ? new Rectangle(Width - height, Height - height, height, height) : Rectangle.Empty;
      }
    }

    protected internal Rectangle GetTabStripRectangle(DockState dockState) {
      int height = MeasureHeight();
      if (dockState == DockState.DockTopAutoHide && PanesTop.Count > 0)
        return new Rectangle(RectangleTopLeft.Width, 0, Width - RectangleTopLeft.Width - RectangleTopRight.Width, height);
      else if (dockState == DockState.DockBottomAutoHide && PanesBottom.Count > 0)
        return new Rectangle(RectangleBottomLeft.Width, Height - height, Width - RectangleBottomLeft.Width - RectangleBottomRight.Width, height);
      else if (dockState == DockState.DockLeftAutoHide && PanesLeft.Count > 0)
        return new Rectangle(0, RectangleTopLeft.Width, height, Height - RectangleTopLeft.Height - RectangleBottomLeft.Height);
      else if (dockState == DockState.DockRightAutoHide && PanesRight.Count > 0)
        return new Rectangle(Width - height, RectangleTopRight.Width, height, Height - RectangleTopRight.Height - RectangleBottomRight.Height);
      else
        return Rectangle.Empty;
    }

    private GraphicsPath m_displayingArea = null;
    private GraphicsPath DisplayingArea {
      get {
        if (m_displayingArea == null)
          m_displayingArea = new GraphicsPath();

        return m_displayingArea;
      }
    }

    private void SetRegion() {
      DisplayingArea.Reset();
      DisplayingArea.AddRectangle(RectangleTopLeft);
      DisplayingArea.AddRectangle(RectangleTopRight);
      DisplayingArea.AddRectangle(RectangleBottomLeft);
      DisplayingArea.AddRectangle(RectangleBottomRight);
      DisplayingArea.AddRectangle(GetTabStripRectangle(DockState.DockTopAutoHide));
      DisplayingArea.AddRectangle(GetTabStripRectangle(DockState.DockBottomAutoHide));
      DisplayingArea.AddRectangle(GetTabStripRectangle(DockState.DockLeftAutoHide));
      DisplayingArea.AddRectangle(GetTabStripRectangle(DockState.DockRightAutoHide));
      Region = new Region(DisplayingArea);
    }

    protected override void OnMouseDown(MouseEventArgs e) {
      base.OnMouseDown(e);

      if (e.Button != MouseButtons.Left)
        return;

      IDockContent content = HitTest();
      if (content == null)
        return;

      content.DockHandler.Activate();
    }

    protected override void OnMouseHover(EventArgs e) {
      base.OnMouseHover(e);

      IDockContent content = HitTest();
      if (content != null && DockPanel.ActiveAutoHideContent != content)
        DockPanel.ActiveAutoHideContent = content;

      // requires further tracking of mouse hover behavior,
      ResetMouseEventArgs();
    }

    protected override void OnLayout(LayoutEventArgs levent) {
      RefreshChanges();
      base.OnLayout(levent);
    }

    internal void RefreshChanges() {
      if (IsDisposed)
        return;

      SetRegion();
      OnRefreshChanges();
    }

    protected virtual void OnRefreshChanges() {
    }

    protected internal abstract int MeasureHeight();

    private IDockContent HitTest() {
      Point ptMouse = PointToClient(Control.MousePosition);
      return HitTest(ptMouse);
    }

    protected virtual Tab CreateTab(IDockContent content) {
      return new Tab(content);
    }

    protected virtual Pane CreatePane(DockPane dockPane) {
      return new Pane(dockPane);
    }

    protected abstract IDockContent HitTest(Point point);
  }
}