The Application in Visual Studio .NET

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1512 The Application
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Now let's write an application that will use all of the properties we just named First we create a Windows application and name it ButtonViewer Then we add controls (for three buttons, one text box, and one panel) to the form by dragging them from the Visual Studio NET toolbox After adding controls to the form, we reposition and resize them, and we change their Text and Name properties The final form looks like Figure 151
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Figure 151 An interactive GUI application
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As Figure 151 shows, two of the buttons are namedBrowse and Close, respectively, and one button has no text TheBrowse button allows us to browse an image file, and the Close button closes the application The TextBox control displays the file name selected by a click of the Browse button The third button (shown larger and without text in Figure 151) displays the image selected by the Browse button Now let's change the background color, foreground color, styles, and fonts of these controls To do so, we add code in the form's load event handler, as shown in Listing 151 As the code indicates, we set the control'sBackColor, ForeColor, FlatStyle, BorderStyle, and Font properties (See 5 for details on fonts and colors)
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Listing 151 Setting a control's BackColor, ForeColor, and Font properties
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private void Form2_Load(object sender, SystemEventArgs e) { // Button 1 button1ForeColor = ColorYellow; button1BackColor = ColorMaroon; button1FlatStyle = FlatStyleFlat; button1Font = new Font ("Verdana", 10, FontStyleBold); // Close and Browse buttons btnCloseForeColor = ColorYellow; btnCloseBackColor = ColorBlack; btnCloseFlatStyle = FlatStyleFlat; btnCloseFont = new Font ("Ariel", 10, FontStyleItalic); btnBrowseForeColor = ColorWhite; btnBrowseBackColor = ColorBlack; btnBrowseFlatStyle = FlatStyleFlat; btnBrowseFont = new Font ("Ariel", 10, FontStyleBold); // Text box 1 textBox1BorderStyle = BorderStyleFixedSingle; textBox1BackColor = ColorBlue; textBox1ForeColor = ColorYellow; textBox1Font = new Font("Tahoma", 10, FontStyleStrikeout|FontStyleBold|
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FontStyleItalic); // Panel 1 panel1BorderStyle = BorderStyleFixedSingle; panel1BackColor = ColorRed; } The Close button click handler simply calls the FormClose method, as shown in Listing 152
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Listing 152 The Close button click event handler
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private void btnClose_Click(object sender, SystemEventArgs e) { thisClose(); } The Browse button click event handler (seeListing 153) uses an OpenFileDialog control to browse for an image and sets the selected image as the background image of the button It also sets the file name as text of the text box control Finally, it calls the Invalidate method to repaint the form
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Listing 153 The Browse button click event handler
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private void btnBrowse_Click(object sender, SystemEventArgs e) { OpenFileDialog fdlg = new OpenFileDialog(); fdlgTitle = "C# Corner Open File Dialog" ; fdlgInitialDirectory = @"c:\" ; fdlgFilter = "Image Files(*BMP;*JPG;*GIF)|" + "*BMP;*JPG;*GIF|All files (**)|**"; fdlgFilterIndex = 2 ; fdlgRestoreDirectory = true ; if(fdlgShowDialog() == DialogResultOK) { button1BackgroundImage = ImageFromFile(fdlgFileName) ; textBox1Text = fdlgFileName; } Invalidate(); }
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1513 Drawing Transparent Controls
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How can I draw transparent controls This is one of the commonly asked questions on discussion forums Drawing transparent controls involves two steps First we set a form's style to enable support for transparent controls We do this by calling the SetStyle method of the form, passing ControlStylesSupportTransparentBackColor as the first argument, and setting the second argument (which in turn sets the SupportTransparentBackColor bit) to true Next we set the control'sBackColor property to a transparent color Either we can use ColorTransparent, or we can create aColor object using an alpha component value less than 255 to provide custom
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semitransparency Listing 154 sets the background color of controls to transparent
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Listing 154 Setting the background color of controls to transparent
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/* Code for transparent controls */ thisSetStyle( ControlStylesSupportsTransparentBackColor, true); button1BackColor = ColorTransparent; btnBrowseBackColor = ColorTransparent; btnCloseBackColor = ColorTransparent; panel1BackColor = ColorFromArgb(70, 0, 0, 255); The output of Listing 154 looks like Figure 152
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