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238 Day 7 The Align Property The Align property controls how a component is aligned with its parent. The possible values for the Align property and a description of each are listed in Table 7.3. Table 7.3. Possible values for the Align property. Value Description alBottom The component will be aligned at the bottom of the parent window. A status bar is an example of a component aligned along the bottom of a main form. alClient The component will expand to fill the client area of the parent window. If other components occupy part of the client area, the component will fill what client area remains. Examples include Memo components, Image components, and RichEdit components. alLeft The component will be aligned along the left edge of the parent window. A horizontal speedbar is an example of a left-aligned component. alNone The component will be placed as designed with no special relationship to the parent. This is the default for most components. alRight The component will be aligned along the right edge of the parent. alTop The component will be aligned along the top of the parent’s window. A speedbar is an example of this type of alignment. An illustration will help explain alignment. Start with a blank form. Then perform these steps: 1. Click on the Standard tab on the Component Palette and choose a Panel component. Place the panel anywhere on the form. 2. Locate the Align property in the Object Inspector (it’s at the top of the list). Notice that it is set on alNone. Change the Align property to alTop. The panel is aligned at the top of the form, and it expands to fill the width of the form. 3. Try to move the panel back to the middle of the form. The panel will snap back to the top of the form. 4. Try to make the panel narrower. Notice that the panel retains its width. 5. Change the panel’s height. Note that the panel’s height can be changed (while the width cannot). 6. Change the Align to alBottom. Now the panel is glued to the bottom of the form. 7. Change the Align to alRight and then alLeft. Notice how the panel keeps its original shape. The width is now the same as the height was before. In effect, the panel is rotated. Again, attempts to vertically move or size the panel fail.
Working with the Form Designer and the Menu Designer 8. Change the Align property to alClient. The panel expands to fill the entire client area of the form. The panel cannot be resized in any dimension. 9. Change the Align property to alNone. The panel can again be sized and moved. As you can see, changing Align to anything other than alNone effectively glues the panel to one edge of the form. In the case of alClient, the panel is glued to all four edges of the form. To illustrate how different components work together, let’s build a prototype of an application that resembles Windows Notepad. NEW TERM NOTE A prototype is an application that has the appearance of a working application but lacks full functionality. C++Builder is perfect for quick prototyping of an application. You can have the main screens and dialog boxes designed and able to be displayed in much less time than it would take with traditional C++ Windows programming tools like OWL or MFC. That is not, however, to say that C++Builder is just for prototyping. C++Builder is fully capable of handling all your 32-bit Windows programming needs. Step 1: Starting a New Application 1. Choose New Application from the main menu. If you’re prompted to save the current project, click No. 2. Change the Name property to ScratchPad. 3. Change the Caption to ScratchPad 1.0. 4. Choose Project | Options from the main menu. Click on the Application tab and enter ScratchPad 1.0 for the application’s title. Click OK to close the Project Options dialog box. Step 2: Building a Speedbar Most Windows applications these days have a speedbar. Building a speedbar requires several steps itself. First, we’ll put a spacer at the top of the window. (You’ll see the benefit of the spacer later, when we add a menu to the application.) Here we go: 1. Choose a Bevel component from the Component Palette and place it on the form (it’s located on the Additional tab). 2. Change the Height property to 2. 3. Change the Align property to alTop. The bevel is placed along the top of the form’s client area. 239 7
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Building Internet Applications Day
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Introduction VCL Explored .........
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