source: branches/PersistenceSpeedUp/HeuristicLab.ExtLibs/HeuristicLab.WinFormsUI/2.3.1/WinFormsUI-2.3.1/Docking/FloatWindow.cs

using System;
using System.Diagnostics.CodeAnalysis;
using System.Drawing;
using System.Security.Permissions;
using System.Windows.Forms;

namespace WeifenLuo.WinFormsUI.Docking {
  public class FloatWindow : Form, INestedPanesContainer, IDockDragSource {
    private NestedPaneCollection m_nestedPanes;
    internal const int WM_CHECKDISPOSE = (int)(Win32.Msgs.WM_USER + 1);

    internal protected FloatWindow(DockPanel dockPanel, DockPane pane) {
      InternalConstruct(dockPanel, pane, false, Rectangle.Empty);
    }

    internal protected FloatWindow(DockPanel dockPanel, DockPane pane, Rectangle bounds) {
      InternalConstruct(dockPanel, pane, true, bounds);
    }

    private void InternalConstruct(DockPanel dockPanel, DockPane pane, bool boundsSpecified, Rectangle bounds) {
      if (dockPanel == null)
        throw (new ArgumentNullException(Strings.FloatWindow_Constructor_NullDockPanel));

      m_nestedPanes = new NestedPaneCollection(this);

      FormBorderStyle = FormBorderStyle.SizableToolWindow;
      ShowInTaskbar = false;
      if (dockPanel.RightToLeft != RightToLeft)
        RightToLeft = dockPanel.RightToLeft;
      if (RightToLeftLayout != dockPanel.RightToLeftLayout)
        RightToLeftLayout = dockPanel.RightToLeftLayout;

      SuspendLayout();
      if (boundsSpecified) {
        Bounds = bounds;
        StartPosition = FormStartPosition.Manual;
      } else {
        StartPosition = FormStartPosition.WindowsDefaultLocation;
        Size = dockPanel.DefaultFloatWindowSize;
      }

      m_dockPanel = dockPanel;
      Owner = DockPanel.FindForm();
      DockPanel.AddFloatWindow(this);
      if (pane != null)
        pane.FloatWindow = this;

      ResumeLayout();
    }

    protected override void Dispose(bool disposing) {
      if (disposing) {
        if (DockPanel != null)
          DockPanel.RemoveFloatWindow(this);
        m_dockPanel = null;
      }
      base.Dispose(disposing);
    }

    private bool m_allowEndUserDocking = true;
    public bool AllowEndUserDocking {
      get { return m_allowEndUserDocking; }
      set { m_allowEndUserDocking = value; }
    }

    public NestedPaneCollection NestedPanes {
      get { return m_nestedPanes; }
    }

    public VisibleNestedPaneCollection VisibleNestedPanes {
      get { return NestedPanes.VisibleNestedPanes; }
    }

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

    public DockState DockState {
      get { return DockState.Float; }
    }

    public bool IsFloat {
      get { return DockState == DockState.Float; }
    }

    internal bool IsDockStateValid(DockState dockState) {
      foreach (DockPane pane in NestedPanes)
        foreach (IDockContent content in pane.Contents)
          if (!DockHelper.IsDockStateValid(dockState, content.DockHandler.DockAreas))
            return false;

      return true;
    }

    protected override void OnActivated(EventArgs e) {
      DockPanel.FloatWindows.BringWindowToFront(this);
      base.OnActivated(e);
      // Propagate the Activated event to the visible panes content objects
      foreach (DockPane pane in VisibleNestedPanes)
        foreach (IDockContent content in pane.Contents)
          content.OnActivated(e);
    }

    protected override void OnDeactivate(EventArgs e) {
      base.OnDeactivate(e);
      // Propagate the Deactivate event to the visible panes content objects
      foreach (DockPane pane in VisibleNestedPanes)
        foreach (IDockContent content in pane.Contents)
          content.OnDeactivate(e);
    }

    protected override void OnLayout(LayoutEventArgs levent) {
      VisibleNestedPanes.Refresh();
      RefreshChanges();
      Visible = (VisibleNestedPanes.Count > 0);
      SetText();

      base.OnLayout(levent);
    }


    [SuppressMessage("Microsoft.Globalization", "CA1303:DoNotPassLiteralsAsLocalizedParameters", MessageId = "System.Windows.Forms.Control.set_Text(System.String)")]
    internal void SetText() {
      DockPane theOnlyPane = (VisibleNestedPanes.Count == 1) ? VisibleNestedPanes[0] : null;

      if (theOnlyPane == null)
        Text = " "; // use " " instead of string.Empty because the whole title bar will disappear when ControlBox is set to false.
      else if (theOnlyPane.ActiveContent == null)
        Text = " ";
      else
        Text = theOnlyPane.ActiveContent.DockHandler.TabText;
    }

    protected override void SetBoundsCore(int x, int y, int width, int height, BoundsSpecified specified) {
      Rectangle rectWorkArea = SystemInformation.VirtualScreen;

      if (y + height > rectWorkArea.Bottom)
        y -= (y + height) - rectWorkArea.Bottom;

      if (y < rectWorkArea.Top)
        y += rectWorkArea.Top - y;

      base.SetBoundsCore(x, y, width, height, specified);
    }

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

        uint result = NativeMethods.SendMessage(this.Handle, (int)Win32.Msgs.WM_NCHITTEST, 0, (uint)m.LParam);
        if (result == 2 && DockPanel.AllowEndUserDocking && this.AllowEndUserDocking) // HITTEST_CAPTION
        {
          Activate();
          m_dockPanel.BeginDrag(this);
        } else
          base.WndProc(ref m);

        return;
      } else if (m.Msg == (int)Win32.Msgs.WM_NCRBUTTONDOWN) {
        uint result = NativeMethods.SendMessage(this.Handle, (int)Win32.Msgs.WM_NCHITTEST, 0, (uint)m.LParam);
        if (result == 2)  // HITTEST_CAPTION
                {
          DockPane theOnlyPane = (VisibleNestedPanes.Count == 1) ? VisibleNestedPanes[0] : null;
          if (theOnlyPane != null && theOnlyPane.ActiveContent != null) {
            theOnlyPane.ShowTabPageContextMenu(this, PointToClient(Control.MousePosition));
            return;
          }
        }

        base.WndProc(ref m);
        return;
      } else if (m.Msg == (int)Win32.Msgs.WM_CLOSE) {
        if (NestedPanes.Count == 0) {
          base.WndProc(ref m);
          return;
        }

        for (int i = NestedPanes.Count - 1; i >= 0; i--) {
          DockContentCollection contents = NestedPanes[i].Contents;
          for (int j = contents.Count - 1; j >= 0; j--) {
            IDockContent content = contents[j];
            if (content.DockHandler.DockState != DockState.Float)
              continue;

            if (!content.DockHandler.CloseButton)
              continue;

            if (content.DockHandler.HideOnClose)
              content.DockHandler.Hide();
            else
              content.DockHandler.Close();
          }
        }

        return;
      } else if (m.Msg == (int)Win32.Msgs.WM_NCLBUTTONDBLCLK) {
        uint result = NativeMethods.SendMessage(this.Handle, (int)Win32.Msgs.WM_NCHITTEST, 0, (uint)m.LParam);
        if (result != 2)  // HITTEST_CAPTION
                {
          base.WndProc(ref m);
          return;
        }

        DockPanel.SuspendLayout(true);

        // Restore to panel
        foreach (DockPane pane in NestedPanes) {
          if (pane.DockState != DockState.Float)
            continue;
          pane.RestoreToPanel();
        }


        DockPanel.ResumeLayout(true, true);
        return;
      } else if (m.Msg == WM_CHECKDISPOSE) {
        if (NestedPanes.Count == 0)
          Dispose();

        return;
      }

      base.WndProc(ref m);
    }

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

      if (VisibleNestedPanes.Count == 0) {
        ControlBox = true;
        return;
      }

      for (int i = VisibleNestedPanes.Count - 1; i >= 0; i--) {
        DockContentCollection contents = VisibleNestedPanes[i].Contents;
        for (int j = contents.Count - 1; j >= 0; j--) {
          IDockContent content = contents[j];
          if (content.DockHandler.DockState != DockState.Float)
            continue;

          if (content.DockHandler.CloseButton && content.DockHandler.CloseButtonVisible) {
            ControlBox = true;
            return;
          }
        }
      }
      //Only if there is a ControlBox do we turn it off
      //old code caused a flash of the window.
      if (ControlBox)
        ControlBox = false;
    }

    public virtual Rectangle DisplayingRectangle {
      get { return ClientRectangle; }
    }

    internal void TestDrop(IDockDragSource dragSource, DockOutlineBase dockOutline) {
      if (VisibleNestedPanes.Count == 1) {
        DockPane pane = VisibleNestedPanes[0];
        if (!dragSource.CanDockTo(pane))
          return;

        Point ptMouse = Control.MousePosition;
        uint lParam = Win32Helper.MakeLong(ptMouse.X, ptMouse.Y);
        if (NativeMethods.SendMessage(Handle, (int)Win32.Msgs.WM_NCHITTEST, 0, lParam) == (uint)Win32.HitTest.HTCAPTION)
          dockOutline.Show(VisibleNestedPanes[0], -1);
      }
    }

    #region IDockDragSource Members

    #region IDragSource Members

    Control IDragSource.DragControl {
      get { return this; }
    }

    #endregion

    bool IDockDragSource.IsDockStateValid(DockState dockState) {
      return IsDockStateValid(dockState);
    }

    bool IDockDragSource.CanDockTo(DockPane pane) {
      if (!IsDockStateValid(pane.DockState))
        return false;

      if (pane.FloatWindow == this)
        return false;

      return true;
    }

    Rectangle IDockDragSource.BeginDrag(Point ptMouse) {
      return Bounds;
    }

    public void FloatAt(Rectangle floatWindowBounds) {
      Bounds = floatWindowBounds;
    }

    public void DockTo(DockPane pane, DockStyle dockStyle, int contentIndex) {
      if (dockStyle == DockStyle.Fill) {
        for (int i = NestedPanes.Count - 1; i >= 0; i--) {
          DockPane paneFrom = NestedPanes[i];
          for (int j = paneFrom.Contents.Count - 1; j >= 0; j--) {
            IDockContent c = paneFrom.Contents[j];
            c.DockHandler.Pane = pane;
            if (contentIndex != -1)
              pane.SetContentIndex(c, contentIndex);
            c.DockHandler.Activate();
          }
        }
      } else {
        DockAlignment alignment = DockAlignment.Left;
        if (dockStyle == DockStyle.Left)
          alignment = DockAlignment.Left;
        else if (dockStyle == DockStyle.Right)
          alignment = DockAlignment.Right;
        else if (dockStyle == DockStyle.Top)
          alignment = DockAlignment.Top;
        else if (dockStyle == DockStyle.Bottom)
          alignment = DockAlignment.Bottom;

        MergeNestedPanes(VisibleNestedPanes, pane.NestedPanesContainer.NestedPanes, pane, alignment, 0.5);
      }
    }

    public void DockTo(DockPanel panel, DockStyle dockStyle) {
      if (panel != DockPanel)
        throw new ArgumentException(Strings.IDockDragSource_DockTo_InvalidPanel, "panel");

      NestedPaneCollection nestedPanesTo = null;

      if (dockStyle == DockStyle.Top)
        nestedPanesTo = DockPanel.DockWindows[DockState.DockTop].NestedPanes;
      else if (dockStyle == DockStyle.Bottom)
        nestedPanesTo = DockPanel.DockWindows[DockState.DockBottom].NestedPanes;
      else if (dockStyle == DockStyle.Left)
        nestedPanesTo = DockPanel.DockWindows[DockState.DockLeft].NestedPanes;
      else if (dockStyle == DockStyle.Right)
        nestedPanesTo = DockPanel.DockWindows[DockState.DockRight].NestedPanes;
      else if (dockStyle == DockStyle.Fill)
        nestedPanesTo = DockPanel.DockWindows[DockState.Document].NestedPanes;

      DockPane prevPane = null;
      for (int i = nestedPanesTo.Count - 1; i >= 0; i--)
        if (nestedPanesTo[i] != VisibleNestedPanes[0])
          prevPane = nestedPanesTo[i];
      MergeNestedPanes(VisibleNestedPanes, nestedPanesTo, prevPane, DockAlignment.Left, 0.5);
    }

    private static void MergeNestedPanes(VisibleNestedPaneCollection nestedPanesFrom, NestedPaneCollection nestedPanesTo, DockPane prevPane, DockAlignment alignment, double proportion) {
      if (nestedPanesFrom.Count == 0)
        return;

      int count = nestedPanesFrom.Count;
      DockPane[] panes = new DockPane[count];
      DockPane[] prevPanes = new DockPane[count];
      DockAlignment[] alignments = new DockAlignment[count];
      double[] proportions = new double[count];

      for (int i = 0; i < count; i++) {
        panes[i] = nestedPanesFrom[i];
        prevPanes[i] = nestedPanesFrom[i].NestedDockingStatus.PreviousPane;
        alignments[i] = nestedPanesFrom[i].NestedDockingStatus.Alignment;
        proportions[i] = nestedPanesFrom[i].NestedDockingStatus.Proportion;
      }

      DockPane pane = panes[0].DockTo(nestedPanesTo.Container, prevPane, alignment, proportion);
      panes[0].DockState = nestedPanesTo.DockState;

      for (int i = 1; i < count; i++) {
        for (int j = i; j < count; j++) {
          if (prevPanes[j] == panes[i - 1])
            prevPanes[j] = pane;
        }
        pane = panes[i].DockTo(nestedPanesTo.Container, prevPanes[i], alignments[i], proportions[i]);
        panes[i].DockState = nestedPanesTo.DockState;
      }
    }

    #endregion
  }
}