Additional User Interface Techniques in Visual Studio .NET

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The next two lines cast your Settings property to the MySettings class This maps the appropriate settings to the MySettings property, so the SettingsKey must be set before performing this cast The middle set of code is similar to the code in the prior section for setting the FormSize setting The code to manually set the FormLocation is also de ned because it was no longer set automatically using binding The last line of code saves your settings This is no longer done automatically, because you are saving your particular settings After the two methods are in place, modify the form Load and FormClosing events in the base form class to call these two methods The form Load event handler is as follows:
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Private Sub PTBaseWin_Load(ByVal sender As Object, _ ByVal e As SystemEventArgs) Handles MeLoad AddEventHandlers(Me) ' Ensure the form is set appropriately as per the settings ApplySettings() End Sub
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The form FormClosing event handler is as follows:
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Private Sub PTBaseWin_FormClosing(ByVal sender As Object, _ ByVal e As SystemWindowsFormsFormClosingEventArgs) _ Handles MeFormClosed SetSettings() End Sub
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If you had two forms called ProductWin and CommentWin, the resulting usercon g le would look similar to this:
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<userSettings> <PTWinMyMySettingsProductWin> <setting name="FormLocation" serializeAs="String"> <value>189, 2</value> </setting> <setting name="FormSize" serializeAs="String"> <value>434, 359</value> </setting> </PTWinMyMySettingsProductWin> <PTWinMyMySettingsCommentWin>
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<setting name="FormLocation" serializeAs="String"> <value>50, 140</value> </setting> <setting name="FormSize" serializeAs="String"> <value>184, 190</value> </setting> </PTWinMyMySettingsCommentWin> </userSettings>
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inherits from the base form class gets a section in this usercon g le to de ne its settings
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NOTE: You may still have the old PTWinMyMySettings tag in your user config file You can clear your userconfig files at any time by clicking the Synchronize button on the Settings tab of the Project Designer as shown in Figure 49 This deletes the userconfig files They are recreated the next time you run the application
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Notice that there are now specialized versions of the PTWin MyMySettings tags for ProductWin and CommentWin Any form that
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If you want to retain properties for each form or for some other specialized keys, use the SettingsKey property Settings you de ned can then be applied to each key, as shown with the FormLocation and FormSize settings in this example
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For the Purchase Tracker sample application: Open the ProductWin form in the Code Editor and remove the code that manages the FormLocation and FormSize settings that you created in the prior Building Along Display the ProductWin form in the Forms Designer and remove the (ApplicationSettings) Location property binding that you set in the prior Building Along Open the base form class (PTBaseWin) in the Code Editor and add the Settings property and ApplySettings and SetSettings methods as defined in this section
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Modify the Load event of the base form class (PTBaseWin) to call the ApplySettings method Add a FormClosing event handler to the base form class (PTBaseWin) to call the SetSettings method Use the Project Designer for the Windows Application project (PTWin) to clear your prior settings by clicking the Synchronize button in the Settings tab, as shown in Figure 49 Run the application It displays your splash screen and then shows the MDI parent form Select Products | Manage Products to display the ProductWin form Size and position the form as desired Close the form and reopen it It appears with the same size and position you had set If desired, find the associated userconfig XML file, and take a look at its contents It now includes a key value with the settings tag
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Drawing Graphics
Drawing graphics was easy in the classic versions of Visual Basic You could use the circle, line, rectangle, or polygon controls to draw just about anything These controls are not available in Visual Studio Instead, you have to write code to perform your drawing To draw graphics on a form: 1 Determine the control on which you would like to draw the graphics You can draw graphics directly on the form or on any control on the form If you draw directly on the form but have other controls, such as panels, that are displayed on the form, the other controls may cover the drawn graphics 2 In the Paint event for the control you are drawing on, create a Pen or Brush object to use for the drawing Use a Pen to draw an object and a Brush to ll an object 3 Include code to set the properties of the Pen or Brush such as a width, style, and so on 4 Also in the Paint event, draw using the PaintEventArgs parameter of the Paint event