Delphi环境使用TrackBar拖动条的实例，拖动实例中的紧身滑块，可改变右侧文字区的高度，拖动水平方向的TrackBar则可改变文本区的宽度，两条TrackBar可随意被拖动，实际使用时，可改变的不只是宽度和方式，可以是很多其它值，比如色彩透明度、音量大孝播放进度等，是使用相当广泛的。-Delphi environment using examples TrackBar drag strip, drag the slider tight instance, can change the height of the text area on the right, drag the horizontal TrackBar can change the width of the text area, two TrackBar can easily be dragged , the actual use, can change not only the width and the way, you can be a lot of other values, such as color transparency, large volume filial playback progress, etc., is used quite extensive.