listBox.C File Reference

This macro gives an example of how to create a list box and how to set and use its multiple selection feature. More...

Go to the source code of this file.

Detailed Description

This macro gives an example of how to create a list box and how to set and use its multiple selection feature.

To run it do either:

.x listBox.C
.x listBox.C++

#include <TApplication.h>
#include <TGClient.h>
#include <TGButton.h>
#include <TGListBox.h>
#include <TList.h>

class MyMainFrame : public TGMainFrame {

private:
   TGListBox           *fListBox;
   TGCheckButton       *fCheckMulti;
   TList               *fSelected;

public:
   MyMainFrame(const TGWindow *p, UInt_t w, UInt_t h);
   virtual ~MyMainFrame();
   void DoExit();
   void DoSelect();
   void HandleButtons();
   void PrintSelected();

   ClassDef(MyMainFrame, 0)
};

void MyMainFrame::DoSelect()
{
   Printf("Slot DoSelect()");
}

void MyMainFrame::DoExit()
{
   Printf("Slot DoExit()");
   gApplication->Terminate(0);
}

MyMainFrame::MyMainFrame(const TGWindow *p, UInt_t w, UInt_t h) :
   TGMainFrame(p, w, h)
{
   // Create main frame

   fListBox = new TGListBox(this, 89);
   fSelected = new TList;
   char tmp[20];
   for (int i = 0; i < 20; ++i) {
      sprintf(tmp, "Entry %i", i+1);
      fListBox->AddEntry(tmp, i+1);
   }
   fListBox->Resize(100,150);
   AddFrame(fListBox, new TGLayoutHints(kLHintsTop | kLHintsLeft |
                                        kLHintsExpandX | kLHintsExpandY,
                                        5, 5, 5, 5));

   fCheckMulti = new TGCheckButton(this, "&Mutliple selection", 10);
   AddFrame(fCheckMulti, new TGLayoutHints(kLHintsTop | kLHintsLeft,
                                           5, 5, 5, 5));
   fCheckMulti->Connect("Clicked()", "MyMainFrame", this, "HandleButtons()");
   // Create a horizontal frame containing button(s)
   TGHorizontalFrame *hframe = new TGHorizontalFrame(this, 150, 20, kFixedWidth);
   TGTextButton *show = new TGTextButton(hframe, "&Show");
   show->SetToolTipText("Click here to print the selection you made");
   show->Connect("Pressed()", "MyMainFrame", this, "PrintSelected()");
   hframe->AddFrame(show, new TGLayoutHints(kLHintsExpandX, 5, 5, 3, 4));
   TGTextButton *exit = new TGTextButton(hframe, "&Exit ");
   exit->Connect("Pressed()", "MyMainFrame", this, "DoExit()");
   hframe->AddFrame(exit, new TGLayoutHints(kLHintsExpandX, 5, 5, 3, 4));
   AddFrame(hframe, new TGLayoutHints(kLHintsExpandX, 2, 2, 5, 1));

   // Set a name to the main frame
   SetWindowName("List Box");
   MapSubwindows();

   // Initialize the layout algorithm via Resize()
   Resize(GetDefaultSize());

   // Map main frame
   MapWindow();
   fListBox->Select(1);
}

MyMainFrame::~MyMainFrame()
{
   // Clean up main frame...
   Cleanup();
   if (fSelected) {
      fSelected->Delete();
      delete fSelected;
   }
}

void MyMainFrame::HandleButtons()
{
   // Handle check button.
   Int_t id;
   TGButton *btn = (TGButton *) gTQSender;
   id = btn->WidgetId();

   printf("HandleButton: id = %d\n", id);

   if (id == 10)
      fListBox->SetMultipleSelections(fCheckMulti->GetState());
}


void MyMainFrame::PrintSelected()
{
   // Writes selected entries in TList if multiselection.

   fSelected->Clear();

   if (fListBox->GetMultipleSelections()) {
      Printf("Selected entries are:\n");
      fListBox->GetSelectedEntries(fSelected);
      fSelected->ls();
   } else {
      Printf("Selected entries is: %d\n", fListBox->GetSelected());
   }
}

void listBox()
{
   // Popup the GUI...
   new MyMainFrame(gClient->GetRoot(), 200, 200);
}

Author

Ilka Antcheva 1/12/2006

Definition in file listBox.C.