On Friday 14 July 2017 18:21:16 Fred van Stappen wrote:
>
> Other thing...
>
> When manually changing the position of the slider, how to get the position
> of the slider before to release the mouse-button ?
>
> I did try with Tslider.onchange but the position does not change until the
> button is released.
>
All MSEgui editwidgets (including tslider) have the
properties "onsetvalue", "ondataentered" and "onchange".
"onsetvalue" will be called when the user enters a value. In case of tslider
the signature is
"
procedure tmainfo.slidersetvalev(const sender: TObject; var avalue: realty;
var accept: Boolean);
"
"avalue" is the new value, "<tslider>.value" still has the old value. Here the
new value can be changed by changing "avalue" or be rejected by
setting "accept" to false.
If the new value has been accepted <tslider.value> will be set to the new
value and "ondataentered" will be called. "ondataentered" has the signature
"
procedure tmainfo.sliderdatentev(const sender: TObject);
"
"onchange" will be called when the "value" changes. "onchange" has the
signature
"
procedure tmainfo.sliderchangeev(const sender: TObject);
"
In order to trigger value settings before releasing the mouse button activate
<tslider>.scrollbar.options sbo_thumbtrack (default true).
I do not like to publish mouse events because this events are used internally
by tslider and are not intended to be used by the component users.
For the the problem with the thread I would do
"
procedure tmainfo.threadexeev(const sender: tthreadcomp);
var
val1: realty;
begin
val1:= 0;
while true do begin
sleep(100);
if sender.terminated then begin
break;
end;
val1:= val1 + 0.01;
if val1 > 1.001 then begin
break;
end;
try
application.lock();
if not tslider1.clicked then begin
tslider1.value:= val1;
end;
finally
application.unlock();
end;
end;
end;
"
Martin
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