两个TrackBar镜像

Question

我想知道如何在trackbar1.position的相反方向创建我的第二个trackbar.position镜像。 例如。 范围从1到100

所以当TrackBar1.Position := 2，然后trackbar2.Position := 99 不管trackbars变为哪种方式，我想在相反的方向，以反映。

继承人我的代码到目前为止:(不感兴趣的使用键来做到这一点），只是鼠标交互。

Direction : string; 
Skip : boolean; 

procedure TForm1.TrackBar1Change(Sender: TObject); 
begin 
if TrackBar1.Position = TrackBar2.Position then 
begin 
if Direction = 'up' then TrackBar2.Position := TrackBar2.Position + 1; 
if Direction = 'down' then TrackBar2.Position := TrackBar2.Position - 1; 
skip := true; 
end; 


if TrackBar1.Position < TrackBar2.Position then 
begin 
if skip = false then 
begin 
TrackBar2.Position := TrackBar2.Position - 1; 
Direction := 'down'; 
end; 
end 
else 
begin 
if skip = false then 
begin 
TrackBar2.Position := TrackBar2.Position + 1; 
Direction := 'up'; 
end; 
end; 
end; 

我可能过度这个。也许有一个更简单的方法。我更喜欢更简单的方式。 谢谢，

本

Answer 1

的2个trackbars OnChange事件都与此代码：

procedure TForm1.TrackBarChange(Sender: TObject); 
var 
    tbSource, tbTarget: TTrackBar; 
begin 
    if Sender = TrackBar1 then // Check the Trackbar which triggers the event 
    begin 
    tbSource := TrackBar1; 
    tbTarget := TrackBar2; 
    end 
    else 
    begin 
    tbSource := TrackBar2; 
    tbTarget := TrackBar1; 
    end; 
    tbTarget.OnChange := nil;       // disable the event on the other trackbar 
    tbTarget.Position := tbSource.Max + tbSource.Min - tbSource.Position; // set the position on the other trackbar 
    tbTarget.OnChange := TrackBarChange;    // define the event back to the other trackbar 

    // Call a function or whatever after this line if you need to do something when it changes 
// lbl1.Caption := IntToStr(TrackBar1.Position); 
// lbl2.Caption := IntToStr(TrackBar2.Position); 
end; 

替代开始（从我肯白色和意见建议; O） ）：

procedure TForm1.TrackBarChange(Sender: TObject); 
var 
    tbSource, tbTarget: TTrackBar; 
begin 
// if Sender is TTrackBar then  // is it called 'from' a trackbar? 
// begin 
    tbSource := TTrackBar(Sender); // Set the source 

    if tbSource = TrackBar1 then // Check the Trackbar which triggers the event 
     tbTarget := TrackBar2 
    else 
     tbTarget := TrackBar1; 

    tbTarget.OnChange := nil;            // disable the event on the other trackbar 
    tbTarget.Position := tbSource.Max + tbSource.Min - tbSource.Position; // set the position on the other trackbar 
    tbTarget.OnChange := TrackBarChange;         // define the event back to the other trackbar 

    // Call a function or whatever after this line if you need to do something when it changes 
// lbl1.Caption := IntToStr(TrackBar1.Position); 
// lbl2.Caption := IntToStr(TrackBar2.Position); 
// end; 
end;