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utils/vgui_panel_zoo/MenuDemo.cpp

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#include "MenuDemo.h"
+
+//-----------------------------------------------------------------------------
+// Purpose: Constructor
+//-----------------------------------------------------------------------------
+MenuDemo::MenuDemo(Panel *parent, const char *name) : DemoPage(parent, name)
+{
+	// It takes 3 parts to make a simple menu.
+	// 1. A MenuButton that triggers the menu to open.
+	// 2. A Menu that opens	when the button is pressed.
+	// 3. MenuItems that are listed in the menu and execute commands when selected.
+
+	// First create a menu button.
+	m_pMenuButton = new MenuButton(this, "AMenuButton", "Press Me To Open Menu!");
+
+	// Size the Button to its label.
+	int wide, tall;
+	m_pMenuButton->GetContentSize(wide, tall);
+	m_pMenuButton->SetSize(wide + Label::Content, tall + Label::Content);
+
+
+	// Next create a menu, and link it to the menu button
+	m_pMenu = new Menu(m_pMenuButton, "AMenu");
+
+	// Now add menu items to the menu. These are the choices that will be seen.
+	
+	// In adding an item the first arg is the name of the item as it will
+	// appear in the list, '&' chars are used to flag windows hotkeys that
+	// will also work to select the item. They will have a little underline
+	// underneath them.
+	// The second arg is a KeyValues structure, that in this case holds a string name
+	// of the command to be sent when the item is selected. 
+	// The third arg is the target of the command, we are sending all commands
+	// back to this class.
+	m_pMenu->AddMenuItem("&Homer", new KeyValues ("Homer"), this);
+	m_pMenu->AddMenuItem("&Apu", new KeyValues ("Apu"), this);
+	m_pMenu->AddMenuItem("&Bart", new KeyValues ("Bart"), this);
+	// A Menu Item with no hotkey
+	m_pMenu->AddMenuItem("Lisa", new KeyValues ("Lisa"), this);
+	m_pMenu->AddMenuItem("&George", new KeyValues ("George"), this);
+	m_pMenu->AddMenuItem("&Marge", new KeyValues ("Marge"), this);
+	// The 'M' hotkey was already used in Marge, 'a' and 'g' are also taken.  
+	// Use another letter not taken for the hotkey.
+	m_pMenu->AddMenuItem("Maggi&e", new KeyValues ("Maggie"), this);
+
+	// Hide the menu to start. The button will make it visible.
+	m_pMenu->SetVisible(false);
+
+	// Tell the menu button which menu it should open.
+	m_pMenuButton->SetMenu(m_pMenu);
+
+	// Position the menu button in the window.
+	int x, y, dwide, dtall;
+	GetBounds (x, y, dwide, dtall);
+	m_pMenuButton->SetPos(10, dtall/2);
+	
+	// By default the menu's width will be that of the largest item it contains.
+
+	// You can also set a fixed width, which we will do so our menu doesn't look so 
+	// scrawny.
+	// Get the size of the menu button
+	m_pMenuButton->GetSize(wide, tall);
+	
+	// Set the width of the menu to be the same as the menu button.
+	// Comment this line out if you want to see the menu in its original scrawny size
+	m_pMenu->SetFixedWidth(wide);
+
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: Destructor
+//-----------------------------------------------------------------------------
+MenuDemo::~MenuDemo()
+{
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: This is the function that will be executed when the "Maggie"
+// messsage is recieved. Selecting the "Maggie" menu item will trigger
+// this message to be sent. This class has been selected as the target of the 
+// button, and our Message Map translates this string message to a function
+// command.
+//-----------------------------------------------------------------------------
+void MenuDemo::OnMaggie()
+{
+     // Put a breakpoint here and watch the code break 
+	// when you select "Maggie"
+	ivgui()->DPrintf("Maggie selected.\n");
+
+}
+
+
+// explain message passing
+MessageMapItem_t MenuDemo::m_MessageMap[] =
+{
+	MAP_MESSAGE( MenuDemo, "Maggie", OnMaggie ),   // from outermenu
+};
+
+IMPLEMENT_PANELMAP(MenuDemo, DemoPage);
+
+
+
+
+Panel* MenuDemo_Create(Panel *parent)
+{
+	return new MenuDemo(parent, "MenuDemo");
+}
+
+