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300 Day 8 The Glyph Property The Glyph property represents the bitmap on the button. The value of the Glyph property is a picture, or glyph. NEW TERM A glyph is a picture that is typically in the form of a Windows bitmap file (BMP). The glyph itself consists of one or more bitmaps that represent the four possible states a button can be in: up, down, disabled, and stay down. If you are creating your own buttons, you can probably get by with supplying just one glyph, which the BitBtn component will then modify to represent the other three possible states. The bitmap will move down and to the left when the button is clicked and will be grayed out when disabled. The glyph in the staydown state will be the same as in the up state, although the button face will change to give a pressed look. If you provide more than one glyph, the glyphs must all be the same height and width and must be contained in a bitmap strip. The bitmaps that ship with C++Builder provide two glyphs. Figure 8.5 shows the bitmap for the print button that comes with C++Builder (PRINT.BMP) in both its actual size and zoomed in to show detail. Note that the two glyphs each occupy the same width in the bitmap. Figure 8.5. The PRINT.BMP bitmap. TIP The pixel in the lower-left corner of the bitmap is the color that will be used for the transparent color. Any pixels in the bitmap having that color will be transparent when the glyph is displayed on the button. You must keep this in mind when designing your bitmaps. If you are not using transparency, you will need the pixel in the lower-left corner to be a color not present anywhere else on the bitmap.
NOTE VCL Components To set the glyph for a BitBtn, double-click the Value column in the Object Inspector next to the Glyph property. The Image Editor will be displayed, and you can choose the bitmap that will be used for the glyph. The standard button glyphs that come with C++Builder are 15×15 pixels in size. This size fits well with the standard button height of 25 pixels. Your glyphs can be any size you like, but the BitBtn component makes no effort to size the button according to the size of the bitmap. If you use larger glyphs, you will have to size the button accordingly. The Kind Property The Kind property is a nice feature of the BitBtn component that allows you to choose from several predefined kinds of buttons. The default value for the Kind property is bkCustom, which means that you will supply the glyph and set any other properties for the button. Choosing any of the other predefined kinds will result in these five things happening: ■ The Glyph property is automatically set for the kind of button chosen. ■ The Cancel or Default properties are modified according to the kind of button chosen. ■ The Caption property is modified for the type of button chosen. ■ The ModalResult property is set according to the kind of button chosen. ■ The button on the form is updated to reflect all these settings. For instance, if you set the value of Kind to bkOK, the button will become an OK button. The glyph is set to a green check mark, the Cancel property is set to false, the Default property is set to true, the ModalResult property is set to mrOk, the Caption property is set to OK, and the results show up on the form. You can always override any of the properties modified by changing the Kind property, but it is not usually necessary to do so. Figure 8.6 shows the Button Test program from http://www.mcp.com/sams/codecenter.html, with the BitBtn Test form displayed. The form contains each of the predefined button types available plus one custom button. The Layout Property The Layout property determines where the button is placed relative to the text. The default is blGlyphLeft. You can also choose to place the glyph on the face of the button to the right of the text, above the text, or below the text. 301 8
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At a Glance At A Glance WEEK 1 In W
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Day 1 Getting Your Feet Wet Week Ge
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Building Internet Applications Day
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C++Builder Extensions to C++ Day 14
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In Review In Review WEEK 2 Wow, tha
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Day 10 Answers to Quiz Questions 1.
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Overview Introduction Introduction
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Introduction VCL Explored .........
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