电子钢琴键盘控件，ctxPiano.ctl源代码，零代码实现炫丽的电子钢琴效果。MIDI播放等。实现鼠标任意键（左、中、右键）按下拖动时，钢琴按键的按下弹起动画效果。依赖于资源文件，钢琴键盘图片，钢琴键盘图片大小（宽 * 高）： 17160 * 2655 Twip （1144 * 177 像素） 52 个白键，36 个黑键。白键：宽 23 （包括两边两条线），高 177，宽算作 22， 1144/52=22，黑键：宽 16，高 118，相邻两黑键距离： 5，Byte 类型不包括负数！有大问题，控件第一次实例化时，不会自动调用 Let 过程，因此需要在运行过程中用代码初始化本控件的属性，属性：按下钢琴某一键时，是否自动发声？-Electronic piano keyboard controls, ctxPiano.ctl source code, code zero electronic piano dazzling effect. MIDI playback. Achieve any mouse button (left, middle, right) is pressed while dragging, press the piano keys bounce animation. Dependent on the resource files, images piano keyboard, piano keyboard picture size (W* H): 17160* 2655 Twip (1144* 177 pixels) 52 white keys, 36 black keys. White keys: W 23 (including both sides of the two lines), high 177, width counted 22, 1144/52 = 22, the black keys: width 16, height 118, the distance between two adjacent black keys: 5, Byte type does not include the negative ! There is a big problem, when the control is first instantiated, does not automatically invoke Let process, requiring initialization code used during the operation of the control s properties, attributes: piano when a key is pressed, whether to automatically sound?