private bool DestroyDesigner()
{
if (this.loader != null)
{
if (this.loader.PromptDispose())
{
this.tabControl.Visible = false;
this.menuItemSave.Enabled = false;
this.menuItemSaveAs.Enabled = false;
this.menuItemEdit.Enabled = false;
this.menuItemView.Enabled = false;
this.menuItemLayout.Enabled = false;
this.menuItemDebug.Enabled = false;
this.panelMain.Controls.Clear();
Application.RemoveMessageFilter(this.filter);
this.filter = null;
this.propertyGrid.Site = null;
this.host.Dispose();
this.loader = null;
this.host = null;
return(true);
}
return(false);
}
return(true);
}
/// This method is called whenever we create a new designer or
/// load one from existing XML.
private void CreateDesigner(SampleDesignerLoader loader)
{
// Our loader will handle loading the file (or creating a blank one).
host = new SampleDesignerHost(hostingServiceContainer);
// The limited events tab functionality we have requires a special kind of
// property grid site.
//
propertyGrid.Site = new PropertyGridSite(host as IServiceProvider, this);
propertyGrid.PropertyTabs.AddTabType(typeof(EventsTab));
host.LoadDocument(loader);
this.loader = loader;
// The toolbox needs access to the IToolboxService and the designers.
toolbox.Host = host;
// Initialize our document window.
host.View.Dock = DockStyle.Fill;
host.View.Visible = true;
panelMain.Controls.Add(host.View);
// These are normally unavailable if we've got no host created.
// Otherwise we gets lots of null reference exceptions.
//
tabControl.Visible = true;
menuItemSave.Enabled = true;
menuItemSaveAs.Enabled = true;
menuItemEdit.Enabled = true;
menuItemView.Enabled = true;
menuItemLayout.Enabled = true;
menuItemDebug.Enabled = true;
// This IMessageFilter is used to intercept and decipher keyboard presses
// that might be instructions for our designer. We have to do it this way
// since we can't have our designer raise KeyPress events.
//
filter = new KeystrokeMessageFilter(host);
Application.AddMessageFilter(filter);
}
private void CreateDesigner(SampleDesignerLoader loader)
{
this.host = new SampleDesignerHost(this.hostingServiceContainer);
this.propertyGrid.Site = new SampleDesignerApplication.PropertyGridSite(this.host, this);
this.propertyGrid.PropertyTabs.AddTabType(typeof(EventsTab));
this.host.LoadDocument(loader);
this.loader = loader;
this.toolbox.Host = this.host;
this.host.View.Dock = DockStyle.Fill;
this.host.View.Visible = true;
this.panelMain.Controls.Add(this.host.View);
this.tabControl.Visible = true;
this.menuItemSave.Enabled = true;
this.menuItemSaveAs.Enabled = true;
this.menuItemEdit.Enabled = true;
this.menuItemView.Enabled = true;
this.menuItemLayout.Enabled = true;
this.menuItemDebug.Enabled = true;
this.filter = new KeystrokeMessageFilter(this.host);
Application.AddMessageFilter(this.filter);
this.host.SelectionChanged += new EventHandler(host_SelectionChanged);
}
/// This is called to destroy our designer (when we load a new one for example).
/// It returns true if our environment has been cleared, false if not (if someone
/// cancels a dispose when prompted to save changes).
private bool DestroyDesigner()
{
if (loader != null)
{
if (loader.PromptDispose())
{
// Again, bad things happen if there's no host loaded and
// certain buttons are pressed in our TabControl or MainMenu.
//
tabControl.Visible = false;
menuItemSave.Enabled = false;
menuItemSaveAs.Enabled = false;
menuItemEdit.Enabled = false;
menuItemView.Enabled = false;
menuItemLayout.Enabled = false;
menuItemDebug.Enabled = false;
// Get rid of our document window.
panelMain.Controls.Clear();
// No need to filter for designer-intended keyboard strokes now.
Application.RemoveMessageFilter(filter);
filter = null;
// Get rid of that property grid site so it doesn't ask for
// any more services from our soon-to-be-disposed host.
//
propertyGrid.Site = null;
host.Dispose();
loader = null;
host = null;
return(true);
}
return(false);
}
return(true);
}