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THE STATUSBAR CLASS
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You can use these events to enable and disable the display of help text in the status bar. The easiest way to do this here is to set the Text property of the status bar to empty whenever the menu loses focus. Either handle the event in the MainForm class or override the protected OnMenuComplete method in your Form class. In a form with status bar panels, the MenuStart and MenuComplete events can be used to toggle between displaying the panels and displaying flyby text on the corresponding status bar. The panels are hidden in the handler for the MenuStart event, and redisplayed in the handler for the MenuComplete event.
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Now that we have seen how to add a status bar and display simple text, we can talk about status bar panels. Panels provide a nice way to encapsulate a specific nugget of information in a single location. As we will see, panels can present both text and graphical information to your users. When designing an application, do not crowd so many panels into your status bar that it becomes cluttered and unusable. Make sure the information you provide is desired and useful to your users. An example of an extraneous panel might be the book and pencil graphic that animates whenever you type into Microsoft Word. A pretty little graphic, but who needs to be told when they are typing Keep your panel information to a minimum, and your users will thank you. For our application, let s add three Figure 4.4 Status bar panels can be dispanels to provide some information on the played with no border, a sunken border, or a raised border (not shown). displayed image. These panels are shown in figure 4.4. The first panel will display the filename of the image; the second the image s dimensions in pixels; and the third will be an owner-drawn panel displaying the percentage of the image currently shown. The following table summarizes these panels. We will use the sbpnl prefix to identify these variables as StatusBarPanel objects.
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StatusBarPanel objects for our application Panel Name sbpnlFileName Contents The file name of the image currently displayed. The dimensions of the image in pixels. The percentage of the image currently shown. Notes Later in the book, we will change this panel to display a user-supplied caption. For now, the file name of the image will suffice. We will write the text for this panel as width x height, as shown in figure 4.4. The percent of image that is shown only changes in the Actual Size display mode. We will show a graphical bar taking up the equivalent percent of the panel.
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sbpnlImageSize sbpnlImagePercent
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In this section we will add the new panels to our status bar, and define some text for the first two panels. The final panel is an owner-drawn panel, and is the subject of section 4.4. 4.3.1 Adding panels to a status bar Let s begin by adding our three panels to the status bar. In Visual Studio, panels are not added via the Toolbox, but rather through the Panels item in the Property window. If you are not using Visual Studio, you can create StatusBarPanel objects like you would any other object for your form.
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Set the version number of the application to 4.3. ADD STATUS BAR PANELS Action 1 In the designer window, display the Properties window for the statusBar1 control. Result
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ADD STATUS BAR PANELS (continued) Action 2 Display the StatusBarPanel Collection Editor dialog for the status bar.
How-to
Result The StatusBarPanel Collection Editor dialog appears, where panels for the status bar can be added and removed.
a. Click the Panels entry in the Properties window. b. Click the small button that appears. Note: The Panels property holds the collection of panels for the status bar.
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