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PANELS
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The Panel class depends largely on its base classes for exported functionality, with the BorderStyle property just about the only new member added by the class. An overview of the Panel class appears in .NET Table 7.5.
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.NET Table 7.5 Panel class
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The Panel class represents a scrollable control that acts as a container for other controls. This class is often used to define a region of controls within a Form. This class is part of the System.Windows.Forms namespace and inherits from the ScrollableControl class. See .NET Table 7 on page 196 for a list of members inherited from the ScrollableControl class. .1 BorderStyle Gets or sets the type of border to display around the control.
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Public Properties
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DisplayRectangle Gets the display area for the control. When scrolling is enabled, this property represents the entire scrollable area (inherited from for the panel. The ClientRectangle property represents Control) the visible portion of the control. Enabled (inherited from Control) Visible (inherited from Control) Gets or sets whether the panel is enabled. Controls within the panel are disabled whenever the panel itself is disabled. Gets or sets whether the panel is visible. Controls within the panel are invisible if the panel itself is invisible.
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UPDATING THE MENU HANDLERS With our panel on the form, we need to update the code for drawing our image to use the new panel rather than interacting with the form itself. We will begin with the menu handlers for the Image submenu. The menuImage_Popup method simply sets the Enabled and Checked menu properties as required for the current display mode. This behavior does not change, so no modifications are required. The menuImage_ChildClick method sets scrolling properties for the form. Since our scrolling will be managed from the Panel object now, we need to use the corresponding Panel members rather than those in the Form itself.
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UPDATE THE MENUIMAGE_CHILDCLICK METHOD TO USE THE NEW PANEL Action 1 Locate the
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menuImage_ChildClick method in
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Result
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protected void menuImage_ChildClick (object sender, System.EventArgs e) { . . . case DisplayMode.ScaleToFit: case DisplayMode.StretchToFit: SetStyle(ControlStyles.ResizeRedraw, true); pnlPhoto.AutoScroll = false; pnlPhoto.Invalidate(); break;
the MainForm.cs source window. 2 Modify the code for the
ScaleToFit and StretchToFit
display mode to set drawing-related properties on the Panel rather than the parent Form.
DRAWING AND SCROLLING
UPDATE THE MENUIMAGE_CHILDCLICK METHOD TO USE THE NEW PANEL Action 3 Modify the code for the
ActualSize display mode in a
Result
case DisplayMode.ActualSize: SetStyle(ControlStyles.ResizeRedraw, false); pnlPhoto.AutoScroll = true; pnlPhoto.Invalidate(); break; . . . }
similar manner.
That s it for our menu handlers. The SetStyle method is a protected member and cannot be modified for our Panel class, so we just force the redraw to happen at the Form level as we did before. This will redraw the entire form and not just our panel, but it gets the job done. In this case, the drawing required outside of our panel is not overly complex, so this extra drawing should not be a problem. On a more complex form, it would make sense to handle the Resize event for the pnlPhoto object instead of setting a form-level style as we do here. Handling the Resize event would allow us to only redraw the panel itself, and not the other parts of the Form. The AutoScroll property is a public member of the ScrollableControl class, so we can set its value for the pnlPhoto object directly. As you can see, because the Panel and Form classes are based on a similar class hierarchy, design changes like this are very easy to make in .NET. Let s move on to our owner-drawn status bar. 7.4.3 DRAWING THE STATUS BAR PANEL Our status bar is drawn in the statusBar1_DrawItem method. This method must calculate the percentage of the image shown in the window. Since the image will now be displayed inside the Panel object, we must modify this routine to use the Panel client area rather than the MainForm one.
UPDATE THE STATUSBAR1_DRAWITEM METHOD TO USE THE PANEL Action 1 Locate the
statusBar1_DrawItem
Result
protected void statusBar1_DrawItem (object sender, StatusBarDrawItemEventArgs sbdevent) { . . .
method in the MainForm.cs file.
PANELS
UPDATE THE STATUSBAR1_DRAWITEM METHOD TO USE THE PANEL (continued) Action 2 Modify the calculation of the percent variable to use the panel rather than the form. Result
// Calculate percent of image shown int percent = 100; if (_selectedMode == DisplayMode.ActualSize) { Photograph photo = _album.CurrentPhoto; Rectangle dr = pnlPhoto.ClientRectangle; int imgWidth = photo.Image.Width; int imgHeight = photo.Image.Height; percent = 100 * Math.Min(dr.Width, imgWidth) * Math.Min(dr.Height, imgHeight) / (imgWidth * imgHeight); } . . . }
Once again this change simply uses our private Panel field rather than the this keyword. Our last change is to draw the image inside the panel rather than on the form itself. 7.4.4 DRAWING THE IMAGE When drawing the image on the form, we were able to override the protected OnPaint method that raises the Paint event. For the Panel object, we do not have access to protected members, so we must use the public Paint event to update the panel. Internally in the Windows Forms library, of course, the Panel control will use its own version of the OnPaint method to invoke our event handler.
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