ArrayCtrlScrollSync
Demosntrates how to synchronize ArrayCtrl scroll position with LineEdit
main.cpp
#include <CtrlLib/CtrlLib.h>
using namespace Upp;
struct MyApp : TopWindow {
LineEdit editor;
ArrayCtrl list;
Splitter splitter;
int dosel = 0;
MyApp();
};
MyApp::MyApp()
{
Add(splitter.SizePos());
splitter.Horz(list, editor);
list.AddRowNumColumn().ConvertBy([=](const Value& v)->Value {
int ii = v;
if(ii >= editor.GetLineCount())
return Null;
return AsString(ii) << " " << FormatIntRoman(ii, true);
});
list.NoHeader().NoGrid().HideSb();
list.NoWantFocus();
String text;
for(int i = 0; i < 1000; i++)
text << "Line " << AsString(i) << "\n";
editor <<= text;
int cy = editor.GetFontSize().cy;
list.SetLineCy(cy);
editor.WhenAction = editor.WhenScroll = [=] {
list.SetVirtualCount(editor.GetLineCount() + 2); // unfortunately, we need 2 more lines to cover LineEdit end of text
list.ScrollTo(editor.GetScrollPos().y * cy);
};
editor.WhenSel = [=] {
if(dosel) // avoid infinite recursion
return;
dosel++;
list.SetCursor(editor.GetCursorLine());
list.WhenAction();
dosel--;
};
list.WhenScroll = [=] {
editor.SetScrollPos(Point(0, list.GetScroll() / cy));
};
list.WhenSel = [=] {
if(dosel) // avoid infinite recursion
return;
dosel++;
int i = list.GetCursor();
if(i >= 0 && i <= editor.GetLength()) {
editor.SetCursor(editor.GetPos(i));
editor.WhenAction();
}
dosel--;
};
editor.WhenAction(); // set initial scroll position in the list
editor.WhenSel(); // set initial cursor position in the list
}
GUI_APP_MAIN
{
MyApp().Run();
}
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