GuiMT
Using event queue for communication between worker threads and GUI
main.cpp
#include "CtrlLib/CtrlLib.h"
using namespace Upp;
#define LAYOUTFILE <GuiMT/Divisors.lay>
#include <CtrlCore/lay.h>
// This example shows older way how to do multithreded GUI using PostCallback to communicate
// between worker thread and main GUI thread.
// While PostCallback is still useful in certain circumstances, new applications are
// perhaps better off using GuiLock and Call, as demostrated in GuiLock reference example.
struct Divisors : public WithDivisorsLayout<TopWindow> {
volatile Atomic terminated;
volatile Atomic threads;
void TestNumber();
void ShowResult(int line, String result);
void SetTitle();
Divisors();
~Divisors();
};
struct DivisorsInfo {
int line;
uint64 number;
Divisors *gui;
};
void WorkerThread(DivisorsInfo f)
{
String r1, r2;
int divisors = 0;
uint64 max = (uint64)sqrt((double)f.number) + 1;
for(uint64 i = 1; i < max; i++) {
if(f.gui->terminated)
break;
if(f.number % i == 0) {
r1 << ' ' << i;
divisors++;
uint64 j = f.number / i;
if (j != i) {
r2 = " " + AsString(j) + r2;
divisors++;
}
PostCallback([=] { f.gui->ShowResult(f.line, "working..." + r1 + r2); });
}
}
PostCallback([=] { f.gui->ShowResult(f.line, AsString(divisors) + ": " + r1 + r2); });
AtomicDec(f.gui->threads);
}
void Divisors::TestNumber()
{
if(IsNull(editor))
return;
DivisorsInfo f;
f.number = stou64((String)~editor);
f.line = table.GetCount();
table.Add(AsString(f.number), "working...");
f.gui = this;
AtomicInc(threads);
Thread().Run(callback1(WorkerThread, f));
SetTitle();
}
void Divisors::ShowResult(int line, String result)
{
table.Set(line, 1, result);
SetTitle();
}
void Divisors::SetTitle()
{
int n = threads;
Title(AsString(n) + " threads");
}
Divisors::Divisors()
{
CtrlLayout(*this, "Window title");
Sizeable().Zoomable();
push << [=] { TestNumber(); };
editor.SetFilter(CharFilterDigit);
table.AddColumn("Number");
table.AddColumn("Divisors");
table.ColumnWidths("135 527");
table.NoCursor();
terminated = 0;
threads = 0;
SetTitle();
}
Divisors::~Divisors()
{
terminated = 1;
while(threads)
Sleep(10);
}
GUI_APP_MAIN
{
Divisors().Run();
}
Divisors.lay
LAYOUT(DivisorsLayout, 700, 440)
ITEM(ArrayCtrl, table, HSizePosZ(12, 12).VSizePosZ(12, 36))
ITEM(Button, push, SetLabel(t_("Test")).LeftPosZ(184, 84).BottomPosZ(9, 19))
ITEM(EditString, editor, LeftPosZ(12, 164).BottomPosZ(9, 19))
END_LAYOUT
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