Figure 159 Displaying a bitmap after reading data from a database in .NET

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The Control class provides a property calledClientRectangle that represents the client area of a control or form Using this property, we can measure the size of a control or a form, and set its position on the Paint event handler or OnPaint method Whenever a user resizes the form, OnPaint is called
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155 Creating Owner-Drawn List Controls
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How to create owner-drawn controls is a frequent topic of discussion forums and newsgroups In this section we will discuss how an owner-drawn process works for Windows controls and how you can create your own controls
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1551 The DrawItem Event
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The DrawItem event is raised by owner-drawn controls This event passes an argument of type DrawItemEventArgs, which contains data related to the event The user uses this data to paint a specific item of the control The properties of the DrawItemEventArgs class are given in Table 151 Besides the properties listed in Table 151, the DrawItemEventArgs class provides two useful methods:DrawBackground and DrawFocusRectangle The DrawBackground method draws the background of the item when we select an item in a control The DrawFocusRectangle method draws a focus rectangle around the text of an item selected in the control These methods take no arguments
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1552 The MeasureItem Event
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The MeasureItem event is raised by owner-drawn controls when the size (width and height) of the items in a control is being determined This event passes an argument of type MeasureItemEventArgs,which contains data related to the event This data is used by the user to paint a specific item of the control The MeasureItemEventArgs class properties are listed inTable 152
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Table 151 DrawItemEventArgs properties
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Property BackColor Bounds Font ForeColor Graphics Index State Background color of the item that is being drawn Rectangle that represents the bounds of the item being drawn Font assigned to the item being drawn Foreground color of the item being drawn Graphics object associated with the item being drawn Index value of the item being drawn State of the item being drawn Description
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Table 152 MeasureItemEventArgs properties
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Property Graphics Index ItemHeight ItemWidth Graphics object associated with the event Index of the item participating in the measure-item event Both get and set Height of the item Both get and set Width of the item Both get and set Description
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1553 Owner-Drawn
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Controls
The ListBox class represents a list box control in Windows Forms This class provides two events DrawItem and MeasureItem that participate in owner drawing processes Briefly, in owner-drawn controls the developer (not the framework) programmatically handles the process of creating controls One example of an owner-drawn control is a list box in which you can change the color, font, and size of the individual items
Note
The DrawMode property of ListBox must be set to DrawModeOwnerDrawVariable
Let's create a Windows application using Visual Studio NET and add a ListBox control by dragging it from the toolbox to the form We start by drawing a list box with different colors, background color, and size Then we set the DrawMode to OwnerDrawVariable using the Properties window Finally, we add the code from Listing 1512 on InitializeComponent after the ListBox code This code sets theDrawMode property of ListBox and adds DrawItem and MeasureItem event handlers
Listing 1512 Adding DrawItem and MeasureItem event handlers
thislistBox1DrawMode = SystemWindowsFormsDrawModeOwnerDrawVariable; thislistBox1MeasureItem += new SystemWindowsFormsMeasureItemEventHandler( thisListBoxMeasureItem); thislistBox1DrawItem += new SystemWindowsFormsDrawItemEventHandler( thisListBoxDrawItem); Next we define four arrays to store the text, size, foreground color, and background color, respectively, of a ListBox item We define the
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following variables in the form class:
private string [] textArray = null; private int [] sizeArray = null; private Color [] colorArray = null; private Color [] backColorArray = null; The next step is to initialize these arrays as in Listing 1513 Our code also binds the text array to theListBox control You can add this code on the form's constructor after InitializeComponent or on the form's load event handler