3.JUCE——Menus菜单控件(1)

2019-11-11 05:08:20

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一：程序效果

菜单6为自定义菜单。

二：菜单程序

2.1 新建JUCE GUI空项目，添加模版 MainWindow.h , MainWindow.cpp 和 Main.cpp。

2.2 新建MenusDemo.h 和 MenusDemo.cpp文件。

MenusDemo.h:

/*  ==============================================================================    MenusDemo.h    Created: 6 Feb 2017 3:21:45pm    Author:  magewell  ==============================================================================*/#ifndef MENUSDEMO_H_INCLUDED#define MENUSDEMO_H_INCLUDED#include "../JuceLibraryCode/JuceHeader.h"enum CommandIDs{	//menu1	menuDemoOneOne = 0x2000,	menuDemoOneTwo = 0x2001,	menuDemoOneThree = 0x2002,	//menu2	menuDemoTwoOne = 0x2003,	menuDemoTwoTwo = 0x2004,	menuDemoTwoThree = 0x2005,	menuDemoTwoFour = 0x2006,	//menu3	menuDemoThreeOne = 0x2007,	menuDemoThreeTwo = 0x2008,	menuDemoThreeThree = 0x2009,	menuDemoThreeFour = 0x200a,	//menu4	menuDemoFourOne = 0x200b,	menuDemoFourTwo = 0x200c,	menuDemoFourThree = 0x200d,	//menu5	menuDemoFiveOne = 0x2100,	menuDemoFiveTwo = 0x2101,	menuDemoFiveThree = 0x2102};class MenusDemo : public Component,	public MenuBarModel,	public Button::Listener{public:	MenusDemo();	~MenusDemo();	//======================================override	void resized() override;	StringArray getMenuBarNames() override;	PopupMenu getMenuForIndex(int menuIndex, const String& /*menuName*/) override;	void menuItemSelected(int menuItemID, int /*topLevelMenuIndex*/) override;	void buttonClicked(Button* button) override;PRotected:	PopupMenu getDummyPopupMenu();private:	TextButton popupButton;	ScopedPointer<MenuBarComponent> menuBar;	//==============================================================================	JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(MenusDemo)};#endif  // MENUSDEMO_H_INCLUDEDCommandIDs 为定义的菜单项ID，当菜单被点击时返回这个值。
JUCE基于MVC架构设计，因此实现菜单需要继承 MenuBarModel 。
菜单类主要完成对以下几个功能的重写：
void resized() override; 对Component类的重写，大小改变时调用，一般在内部重绘子组件(例如本例的TextButton)。StringArray getMenuBarNames() override;  对MenuBarModel 类的重写，返回菜单名称。PopupMenu getMenuForIndex(int menuIndex, const String& /*menuName*/) override; 对 MenuBarModel类的重写，返回菜单子项。void menuItemSelected(int menuItemID, int /*topLevelMenuIndex*/) override; 对 MenuBarModel类的重写，菜单选择事件响应。 void buttonClicked(Button* button) override;对 Button::Listener类的重写，TextButton的点击事件响应。
MenusDemo.cpp:
/*  ==============================================================================    MenusDemo.cpp    Created: 6 Feb 2017 3:21:45pm    Author:  magewell  ==============================================================================*/#include "MenusDemo.h"//Construct/DeConstructMenusDemo::MenusDemo(){	menuBar = new MenuBarComponent(this);	addAndMakeVisible(menuBar);	popupButton.setButtonText("Show Popup Menu");	popupButton.setTriggeredOnMouseDown(true);	popupButton.addListener(this);	addAndMakeVisible(popupButton);}MenusDemo::~MenusDemo(){	PopupMenu::dismissAllActiveMenus();	popupButton.removeListener(this);}//overridevoid MenusDemo::resized(){	Rectangle<int> area(getLocalBounds());	menuBar->setBounds(area.removeFromTop(LookAndFeel::getDefaultLookAndFeel().getDefaultMenuBarHeight()));	area.removeFromTop(20);	area = area.removeFromTop(33);	popupButton.setBounds(area.removeFromLeft(200).reduced(5));}StringArray MenusDemo::getMenuBarNames(){	const char* const names[] = { "Menu1", "Menu2", "Menu3", "Menu4", "Menu5", "Menu6", nullptr };	return StringArray(names);}PopupMenu MenusDemo::getMenuForIndex(int menuIndex, const String& /*menuName*/){	PopupMenu menu;	if (menuIndex == 0)	{		menu.addItem(menuDemoOneOne,"menuDemoOneOne");		menu.addItem(menuDemoOneTwo,"menuDemoOneTwo");		menu.addSeparator();		menu.addItem(menuDemoOneThree,"menuDemoOneThree");	}	else if (menuIndex == 1)	{		menu.addItem(menuDemoTwoOne,"menuDemoTwoOne");		menu.addItem(menuDemoTwoTwo,"menuDemoTwoTwo");		menu.addItem(menuDemoTwoThree,"menuDemoTwoThree");		menu.addSeparator();		menu.addItem(menuDemoTwoFour,"menuDemoTwoFour");	}	else if (menuIndex == 2)	{		menu.addItem(menuDemoThreeOne,"menuDemoThreeOne");		menu.addItem(menuDemoThreeTwo,"menuDemoThreeTwo");		menu.addItem(menuDemoThreeThree,"menuDemoThreeThree");		menu.addItem(menuDemoThreeFour,"menuDemoThreeFour");	}	else if (menuIndex == 3)	{		menu.addItem(menuDemoFourOne,"menuDemoFourOne");		menu.addItem(menuDemoFourTwo,"menuDemoFourTwo");		menu.addItem(menuDemoFourThree,"menuDemoFourThree");	}	else if (menuIndex == 4)	{		menu.addItem(menuDemoFiveOne,"menuDemoFiveOne");		menu.addItem(menuDemoFiveTwo,"menuDemoFiveTwo");		menu.addItem(menuDemoFiveThree,"menuDemoFiveThree");	}	else if (menuIndex == 5)	{		return getDummyPopupMenu();	}	return menu;}void MenusDemo::menuItemSelected(int menuItemID, int /*topLevelMenuIndex*/){	//every command enter this...	printf("commands .../n");}void MenusDemo::buttonClicked(Button* button){	if (button == &popupButton)		getDummyPopupMenu().showMenuAsync(PopupMenu::Options().withTargetComponent(&popupButton), nullptr);}//protectedPopupMenu MenusDemo::getDummyPopupMenu(){	PopupMenu m;	m.addItem(1, "Normal item");	m.addItem(2, "Disabled item", false);	m.addItem(3, "Ticked item", true, true);	m.addColouredItem(4, "Coloured item", Colours::green);	m.addSeparator();	for (int i = 0; i < 8; ++i)	{		PopupMenu subMenu;		for (int s = 0; s < 8; ++s)		{			PopupMenu subSubMenu;			for (int item = 0; item < 8; ++item)				subSubMenu.addItem(1000 + (i * s * item), "Item " + String(item + 1));			subMenu.addSubMenu("Sub-sub menu " + String(s + 1), subSubMenu);		}		m.addSubMenu("Sub menu " + String(i + 1), subMenu);	}	return m;}当菜单被点击时进入 menuItemSelected 消息响应。
三：将MenusDemo加入主Component：
class MainContentComponent : public Component{public:	MainContentComponent()	{		menusDemo = new MenusDemo;		addAndMakeVisible(menusDemo);	}	~MainContentComponent()	{		menusDemo = nullptr;	}	//=================================================override	void paint(Graphics &g) override	{		g.fillAll(Colour(0xff001F36));		//g.setFont(Font(16.0f));		//g.setColour(Colours::white);		//g.drawText("Hello World!", getLocalBounds(), Justification::centred, true);	}	void resized() override	{		Rectangle<int> area(getLocalBounds());		menusDemo->setBounds(area);	}private:	ScopedPointer<MenusDemo> menusDemo;	JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(MainContentComponent);};