source: trunk/sources/HeuristicLab.ExtLibs/HeuristicLab.WinFormsUI/2.3.1/WinFormsUI-2.3.1/Docking/DockPanel.MdiClientController.cs @ 5304

using System;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Drawing;
using System.Windows.Forms;

namespace WeifenLuo.WinFormsUI.Docking {
  partial class DockPanel {
    //  This class comes from Jacob Slusser's MdiClientController class:
    //  http://www.codeproject.com/cs/miscctrl/mdiclientcontroller.asp
    private class MdiClientController : NativeWindow, IComponent, IDisposable {
      private bool m_autoScroll = true;
      private BorderStyle m_borderStyle = BorderStyle.Fixed3D;
      private MdiClient m_mdiClient = null;
      private Form m_parentForm = null;
      private ISite m_site = null;

      public MdiClientController() {
      }

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

      protected virtual void Dispose(bool disposing) {
        if (disposing) {
          lock (this) {
            if (Site != null && Site.Container != null)
              Site.Container.Remove(this);

            if (Disposed != null)
              Disposed(this, EventArgs.Empty);
          }
        }
      }

      public bool AutoScroll {
        get { return m_autoScroll; }
        set {
          // By default the MdiClient control scrolls. It can appear though that
          // there are no scrollbars by turning them off when the non-client
          // area is calculated. I decided to expose this method following
          // the .NET vernacular of an AutoScroll property.
          m_autoScroll = value;
          if (MdiClient != null)
            UpdateStyles();
        }
      }

      public BorderStyle BorderStyle {
        set {
          // Error-check the enum.
          if (!Enum.IsDefined(typeof(BorderStyle), value))
            throw new InvalidEnumArgumentException();

          m_borderStyle = value;

          if (MdiClient == null)
            return;

          // This property can actually be visible in design-mode,
          // but to keep it consistent with the others,
          // prevent this from being show at design-time.
          if (Site != null && Site.DesignMode)
            return;

          // There is no BorderStyle property exposed by the MdiClient class,
          // but this can be controlled by Win32 functions. A Win32 ExStyle
          // of WS_EX_CLIENTEDGE is equivalent to a Fixed3D border and a
          // Style of WS_BORDER is equivalent to a FixedSingle border.

          // This code is inspired Jason Dori's article:
          // "Adding designable borders to user controls".
          // http://www.codeproject.com/cs/miscctrl/CsAddingBorders.asp

          // Get styles using Win32 calls
          int style = NativeMethods.GetWindowLong(MdiClient.Handle, (int)Win32.GetWindowLongIndex.GWL_STYLE);
          int exStyle = NativeMethods.GetWindowLong(MdiClient.Handle, (int)Win32.GetWindowLongIndex.GWL_EXSTYLE);

          // Add or remove style flags as necessary.
          switch (m_borderStyle) {
            case BorderStyle.Fixed3D:
              exStyle |= (int)Win32.WindowExStyles.WS_EX_CLIENTEDGE;
              style &= ~((int)Win32.WindowStyles.WS_BORDER);
              break;

            case BorderStyle.FixedSingle:
              exStyle &= ~((int)Win32.WindowExStyles.WS_EX_CLIENTEDGE);
              style |= (int)Win32.WindowStyles.WS_BORDER;
              break;

            case BorderStyle.None:
              style &= ~((int)Win32.WindowStyles.WS_BORDER);
              exStyle &= ~((int)Win32.WindowExStyles.WS_EX_CLIENTEDGE);
              break;
          }

          // Set the styles using Win32 calls
          NativeMethods.SetWindowLong(MdiClient.Handle, (int)Win32.GetWindowLongIndex.GWL_STYLE, style);
          NativeMethods.SetWindowLong(MdiClient.Handle, (int)Win32.GetWindowLongIndex.GWL_EXSTYLE, exStyle);

          // Cause an update of the non-client area.
          UpdateStyles();
        }
      }

      public MdiClient MdiClient {
        get { return m_mdiClient; }
      }

      [Browsable(false)]
      public Form ParentForm {
        get { return m_parentForm; }
        set {
          // If the ParentForm has previously been set,
          // unwire events connected to the old parent.
          if (m_parentForm != null) {
            m_parentForm.HandleCreated -= new EventHandler(ParentFormHandleCreated);
            m_parentForm.MdiChildActivate -= new EventHandler(ParentFormMdiChildActivate);
          }

          m_parentForm = value;

          if (m_parentForm == null)
            return;

          // If the parent form has not been created yet,
          // wait to initialize the MDI client until it is.
          if (m_parentForm.IsHandleCreated) {
            InitializeMdiClient();
            RefreshProperties();
          } else
            m_parentForm.HandleCreated += new EventHandler(ParentFormHandleCreated);

          m_parentForm.MdiChildActivate += new EventHandler(ParentFormMdiChildActivate);
        }
      }

      public ISite Site {
        get { return m_site; }
        set {
          m_site = value;

          if (m_site == null)
            return;

          // If the component is dropped onto a form during design-time,
          // set the ParentForm property.
          IDesignerHost host = (value.GetService(typeof(IDesignerHost)) as IDesignerHost);
          if (host != null) {
            Form parent = host.RootComponent as Form;
            if (parent != null)
              ParentForm = parent;
          }
        }
      }

      public void RenewMdiClient() {
        // Reinitialize the MdiClient and its properties.
        InitializeMdiClient();
        RefreshProperties();
      }

      public event EventHandler Disposed;

      public event EventHandler HandleAssigned;

      public event EventHandler MdiChildActivate;

      public event LayoutEventHandler Layout;

      protected virtual void OnHandleAssigned(EventArgs e) {
        // Raise the HandleAssigned event.
        if (HandleAssigned != null)
          HandleAssigned(this, e);
      }

      protected virtual void OnMdiChildActivate(EventArgs e) {
        // Raise the MdiChildActivate event
        if (MdiChildActivate != null)
          MdiChildActivate(this, e);
      }

      protected virtual void OnLayout(LayoutEventArgs e) {
        // Raise the Layout event
        if (Layout != null)
          Layout(this, e);
      }

      public event PaintEventHandler Paint;

      protected virtual void OnPaint(PaintEventArgs e) {
        // Raise the Paint event.
        if (Paint != null)
          Paint(this, e);
      }

      protected override void WndProc(ref Message m) {
        switch (m.Msg) {
          case (int)Win32.Msgs.WM_NCCALCSIZE:
            // If AutoScroll is set to false, hide the scrollbars when the control
            // calculates its non-client area.
            if (!AutoScroll)
              NativeMethods.ShowScrollBar(m.HWnd, (int)Win32.ScrollBars.SB_BOTH, 0 /*false*/);
            break;
        }

        base.WndProc(ref m);
      }

      private void ParentFormHandleCreated(object sender, EventArgs e) {
        // The form has been created, unwire the event, and initialize the MdiClient.
        this.m_parentForm.HandleCreated -= new EventHandler(ParentFormHandleCreated);
        InitializeMdiClient();
        RefreshProperties();
      }

      private void ParentFormMdiChildActivate(object sender, EventArgs e) {
        OnMdiChildActivate(e);
      }

      private void MdiClientLayout(object sender, LayoutEventArgs e) {
        OnLayout(e);
      }

      private void MdiClientHandleDestroyed(object sender, EventArgs e) {
        // If the MdiClient handle has been released, drop the reference and
        // release the handle.
        if (m_mdiClient != null) {
          m_mdiClient.HandleDestroyed -= new EventHandler(MdiClientHandleDestroyed);
          m_mdiClient = null;
        }

        ReleaseHandle();
      }

      private void InitializeMdiClient() {
        // If the mdiClient has previously been set, unwire events connected
        // to the old MDI.
        if (MdiClient != null) {
          MdiClient.HandleDestroyed -= new EventHandler(MdiClientHandleDestroyed);
          MdiClient.Layout -= new LayoutEventHandler(MdiClientLayout);
        }

        if (ParentForm == null)
          return;

        // Get the MdiClient from the parent form.
        foreach (Control control in ParentForm.Controls) {
          // If the form is an MDI container, it will contain an MdiClient control
          // just as it would any other control.

          m_mdiClient = control as MdiClient;
          if (m_mdiClient == null)
            continue;

          // Assign the MdiClient Handle to the NativeWindow.
          ReleaseHandle();
          AssignHandle(MdiClient.Handle);

          // Raise the HandleAssigned event.
          OnHandleAssigned(EventArgs.Empty);

          // Monitor the MdiClient for when its handle is destroyed.
          MdiClient.HandleDestroyed += new EventHandler(MdiClientHandleDestroyed);
          MdiClient.Layout += new LayoutEventHandler(MdiClientLayout);

          break;
        }
      }

      private void RefreshProperties() {
        // Refresh all the properties
        BorderStyle = m_borderStyle;
        AutoScroll = m_autoScroll;
      }

      private void UpdateStyles() {
        // To show style changes, the non-client area must be repainted. Using the
        // control's Invalidate method does not affect the non-client area.
        // Instead use a Win32 call to signal the style has changed.
        NativeMethods.SetWindowPos(MdiClient.Handle, IntPtr.Zero, 0, 0, 0, 0,
            Win32.FlagsSetWindowPos.SWP_NOACTIVATE |
            Win32.FlagsSetWindowPos.SWP_NOMOVE |
            Win32.FlagsSetWindowPos.SWP_NOSIZE |
            Win32.FlagsSetWindowPos.SWP_NOZORDER |
            Win32.FlagsSetWindowPos.SWP_NOOWNERZORDER |
            Win32.FlagsSetWindowPos.SWP_FRAMECHANGED);
      }
    }

    private MdiClientController m_mdiClientController = null;
    private MdiClientController GetMdiClientController() {
      if (m_mdiClientController == null) {
        m_mdiClientController = new MdiClientController();
        m_mdiClientController.HandleAssigned += new EventHandler(MdiClientHandleAssigned);
        m_mdiClientController.MdiChildActivate += new EventHandler(ParentFormMdiChildActivate);
        m_mdiClientController.Layout += new LayoutEventHandler(MdiClient_Layout);
      }

      return m_mdiClientController;
    }

    private void ParentFormMdiChildActivate(object sender, EventArgs e) {
      if (GetMdiClientController().ParentForm == null)
        return;

      IDockContent content = GetMdiClientController().ParentForm.ActiveMdiChild as IDockContent;
      if (content == null)
        return;

      if (content.DockHandler.DockPanel == this && content.DockHandler.Pane != null)
        content.DockHandler.Pane.ActiveContent = content;
    }

    private bool MdiClientExists {
      get { return GetMdiClientController().MdiClient != null; }
    }

    private void SetMdiClientBounds(Rectangle bounds) {
      GetMdiClientController().MdiClient.Bounds = bounds;
    }

    private void SuspendMdiClientLayout() {
      if (GetMdiClientController().MdiClient != null)
        GetMdiClientController().MdiClient.SuspendLayout();
    }

    private void ResumeMdiClientLayout(bool perform) {
      if (GetMdiClientController().MdiClient != null)
        GetMdiClientController().MdiClient.ResumeLayout(perform);
    }

    private void PerformMdiClientLayout() {
      if (GetMdiClientController().MdiClient != null)
        GetMdiClientController().MdiClient.PerformLayout();
    }

    // Called when:
    // 1. DockPanel.DocumentStyle changed
    // 2. DockPanel.Visible changed
    // 3. MdiClientController.Handle assigned
    private void SetMdiClient() {
      MdiClientController controller = GetMdiClientController();

      if (this.DocumentStyle == DocumentStyle.DockingMdi) {
        controller.AutoScroll = false;
        controller.BorderStyle = BorderStyle.None;
        if (MdiClientExists)
          controller.MdiClient.Dock = DockStyle.Fill;
      } else if (DocumentStyle == DocumentStyle.DockingSdi || DocumentStyle == DocumentStyle.DockingWindow) {
        controller.AutoScroll = true;
        controller.BorderStyle = BorderStyle.Fixed3D;
        if (MdiClientExists)
          controller.MdiClient.Dock = DockStyle.Fill;
      } else if (this.DocumentStyle == DocumentStyle.SystemMdi) {
        controller.AutoScroll = true;
        controller.BorderStyle = BorderStyle.Fixed3D;
        if (controller.MdiClient != null) {
          controller.MdiClient.Dock = DockStyle.None;
          controller.MdiClient.Bounds = SystemMdiClientBounds;
        }
      }
    }

    internal Rectangle RectangleToMdiClient(Rectangle rect) {
      if (MdiClientExists)
        return GetMdiClientController().MdiClient.RectangleToClient(rect);
      else
        return Rectangle.Empty;
    }
  }
}