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.

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