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.NET Table 7.4 ControlStyles enumeration
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The ControlStyles enumeration specifies a set of values related to the interaction of a control with the Windows desktop. These styles define how low-level Windows messages are processed by the control when a user interacts with it in various ways. This enumeration is part of the System.Windows.Forms namespace. The values in this enumeration can be combined using the bitwise or operator. The protected GetStyle and SetStyle methods in the Control class can be used to modify these settings for a control. DoubleBuffer Whether to perform drawing in a buffer and output the result to the screen after it completes. This prevents flicker caused by redrawing the control. Whether the control has a fixed height. Whether the control has a fixed width. Whether the control is completely redrawn when it is resized. Whether the control can get the focus. Whether OnClick is called when the control is single-clicked. Note that the control may still call OnClick directly.
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FixedHeight FixedWidth ResizeRedraw Selectable Enumeration Values StandardClick
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StandardDoubleClick Whether OnDoubleClick is called when the control is double clicked. Note that the control may still call OnDoubleClick directly. UserMouse Whether the control does its own mouse processing. If so, then mouse messages are not passed to the control.a Whether the control paints itself. If so, then paint messages are not passed to the control.
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UserPaint
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a. Actually, the messages here are not passed to the underlying NativeWindow object, but you can think of it as the control itself. For UserMouse, this affects the WM_MOUSEDOWN, WM_MOUSEMOVE, and WM_MOUSEUP messages. For UserPaint, this affects the WM_PAINT and WM_ERASEBKGND messages.
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DRAWING AND SCROLLING
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The .NET Framework defines a ControlStyles enumeration, summarized in .NET Table 7.4, for customizing the behavior of a control. The values defined by this enumeration indicate how the control appears or responds in various situations related to desktop interaction with a user, and are useful for customizing the behavior of a Form or other custom control class. The Control class provides a SetStyle method to set these styles, and a GetStyle method to retrieve the current setting for these styles. These methods are protected, so you must inherit from an existing control in order to modify these styles. For our purposes, you may have noticed the ResizeRedraw style, which we can use to force our application to redraw itself every time the user resizes the window.
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FORCE THE FORM TO REDRAW WHEN RESIZED Action 1 Locate the
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menuImage_ChildClick
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Result
protected void menuImage_ChildClick (object sender, System.EventArgs e) { . . . switch (_selectedMode) { default: case DisplayMode.ScaleToFit: case DisplayMode.StretchToFit: SetStyle(ControlStyles.ResizeRedraw, true); Invalidate(); break; . . . } . . . }
method in the MainForm.cs source file. 2 Modify the logic when the display mode is ScaleToFit or StretchToFit to force a redraw whenever the form resizes.
Note: Since the logic is the same for these two modes, we have merged these two case labels into a single block. C# allows a case label to fall through to the next label only if it has no code associated with it.
We will make one other change here before testing our program. When the program begins, the ResizeRedraw style is not set to true. Only after the user makes a selection will this style be set appropriately. A simple solution would be to set the ResizeRedraw style in the constructor for our form. This works, but does not account for any future changes to the menuImage_ChildClick method. Since such changes will occur in the next section, a more robust solution is to simulate an Image menu selection directly from the constructor. Simulating a call to an event handler during control initialization is a good way to ensure that future changes to the handler are dealt with during initialization. It also allows you to make such changes in only one place. We did this in the previous chapter for the New menu. Let s do this here by continuing the previous steps. IMAGE DRAWING 211
SIMULATE AN IMAGE MENU CLICK IN MAINFORM CONSTRUCTOR Action 3 Locate the MainForm constructor in the MainForm.cs source window. Add a call to
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