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

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

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

      public Tab(IDockContent content) {
        m_content = content;
      }

      ~Tab() {
        Dispose(false);
      }

      public IDockContent Content {
        get { return m_content; }
      }

      public Form ContentForm {
        get { return m_content as Form; }
      }

      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;
      public DockPane DockPane {
        get { return m_dockPane; }
      }

      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"));
          return content.DockHandler.GetTab(DockPane.TabStripControl);
        }
      }

      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 DockPane.DisplayingContents.IndexOf(tab.Content);
      }

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

    protected DockPaneStripBase(DockPane pane) {
      m_dockPane = pane;

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

    private DockPane m_dockPane;
    protected DockPane DockPane {
      get { return m_dockPane; }
    }

    protected DockPane.AppearanceStyle Appearance {
      get { return DockPane.Appearance; }
    }

    private TabCollection m_tabs = null;
    protected TabCollection Tabs {
      get {
        if (m_tabs == null)
          m_tabs = new TabCollection(DockPane);

        return m_tabs;
      }
    }

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

      OnRefreshChanges();
    }

    protected virtual void OnRefreshChanges() {
    }

    protected internal abstract int MeasureHeight();

    protected internal abstract void EnsureTabVisible(IDockContent content);

    protected int HitTest() {
      return HitTest(PointToClient(Control.MousePosition));
    }

    protected internal abstract int HitTest(Point point);

    protected internal abstract GraphicsPath GetOutline(int index);

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

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

      int index = HitTest();
      if (index != -1) {
        IDockContent content = Tabs[index].Content;
        if (DockPane.ActiveContent != content)
          DockPane.ActiveContent = content;
      }

      if (e.Button == MouseButtons.Left) {
        if (DockPane.DockPanel.AllowEndUserDocking && DockPane.AllowDockDragAndDrop && DockPane.ActiveContent.DockHandler.AllowEndUserDocking)
          DockPane.DockPanel.BeginDrag(DockPane.ActiveContent.DockHandler);
      }
    }

    protected bool HasTabPageContextMenu {
      get { return DockPane.HasTabPageContextMenu; }
    }

    protected void ShowTabPageContextMenu(Point position) {
      DockPane.ShowTabPageContextMenu(this, position);
    }

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

      if (e.Button == MouseButtons.Right)
        ShowTabPageContextMenu(new Point(e.X, e.Y));
    }

    [SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)]
    protected override void WndProc(ref Message m) {
      if (m.Msg == (int)Win32.Msgs.WM_LBUTTONDBLCLK) {
        base.WndProc(ref m);

        int index = HitTest();
        if (DockPane.DockPanel.AllowEndUserDocking && index != -1) {
          IDockContent content = Tabs[index].Content;
          if (content.DockHandler.CheckDockState(!content.DockHandler.IsFloat) != DockState.Unknown)
            content.DockHandler.IsFloat = !content.DockHandler.IsFloat;
        }

        return;
      }

      base.WndProc(ref m);
      return;
    }

    protected override void OnDragOver(DragEventArgs drgevent) {
      base.OnDragOver(drgevent);

      int index = HitTest();
      if (index != -1) {
        IDockContent content = Tabs[index].Content;
        if (DockPane.ActiveContent != content)
          DockPane.ActiveContent = content;
      }
    }
  }
}