我正在尝试检测标签何时被点击/指向/点击。我来自于Win32、C++和Java Swing的编程,我知道这两种语言在注册事件/输入时采用了不同的方法。
我看过教程,但我找不到一个检测点击的例子。有没有一个表示点击的常量,这样我就可以在keyPressEvent (比如win32 & WM_LBUTTONDOWN)中检测到它了?或者我需要首先注册点击,然后调用我自己的函数来处理点击(就像Java & .addActionListener())?
我尝试检测下面的点击不起作用:
#include <MAUtil/Moblet.h>
#include <MAUI/Layout.h>
#include <MAUI/ListBox.h>
#include <MAUI/Label.h>
#include <MAUI/EditBox.h>
#include <MAUI/Screen.h>
#include <MAUtil/Environment.h>
#include <madmath.h>
#include <conprint.h>
using namespace MAUtil;
using namespace MAUI;
class MouseScreen : public Screen, public PointerListener
{
private:
Label *testLabel;
public:
MouseScreen()
{
MAExtent screenDim = maGetScrSize();
Layout* mainLayout = new Layout( 0, 0, EXTENT_X(screenDim), EXTENT_Y(screenDim), NULL, 1, 3 );
ListBox* mainListBox = new ListBox( 0, 0, 100, 200, mainLayout,
ListBox::LBO_VERTICAL, ListBox::LBA_LINEAR,
true );
mainListBox -> setPaddingLeft( 10 );
mainListBox -> setPaddingRight( 10 );
mainListBox -> setPaddingTop( 10 );
mainListBox -> setPaddingBottom( 10 );
mainListBox -> setBackgroundColor( 900 );
mainLayout -> setBackgroundColor( 300 );
testLabel = new Label( 10, 300, 50, 20, mainLayout );
//testLabel -> addPointerListener( this );
testLabel -> setCaption( "Click me" );
mainLayout -> add( testLabel );
}
void pointerPressEvent( MAPoint2d p )
{
printf( "clicked" ); // never occurs
// OR
if ( testLabel.contains((MouseScreen*)p) )
{
printf( "Label clicked" );
}
// Should I call parent function
// PointerListener :: pointerPressEvent( p );
}
void pointerMoveEvent( MAPoint2d p ) {}
void pointerReleaseEvent( MAPoint2d p ) {}
};
class MouseMoblet : public Moblet
{
public:
MouseMoblet()
{
instance = new MouseScreen();
instance -> show();
}
~MouseMoblet()
{
delete instance;
}
void keyPressEvent(int keyCode, int nativeCode)
{
// todo: handle key presses
printf( "Blah" ); // never occurs when I press the mouse, but other KEYS work
}
void keyReleaseEvent(int keyCode, int nativeCode)
{
// todo: handle key releases
}
private:
MouseScreen *instance;
};
extern "C" int MAMain()
{
Moblet::run(new MouseMoblet());
return 0;
};发布于 2011-03-11 23:49:55
我可以看到一些你需要做的事情。首先,您需要通过调用setMain( mainLayout )将mainLayout设置为Screen的主小部件。这使屏幕能够识别mainLayout,以便可以绘制它。一旦你做到了这一点,你将能够在屏幕上看到你的小部件,你也应该得到点击事件。
在pointerPressedEvent中,您几乎是对的,testLabel的contains方法接受一个点,而不是一个屏幕。您在这里应该做的是调用testLabel->contains( p.x,p.y )来评估是否单击了testLabel。
修改后的完整代码如下所示:
#include <MAUtil/Moblet.h>
#include <MAUI/Layout.h>
#include <MAUI/ListBox.h>
#include <MAUI/Label.h>
#include <MAUI/EditBox.h>
#include <MAUI/Screen.h>
#include <MAUtil/Environment.h>
#include <madmath.h>
#include <conprint.h>
using namespace MAUtil;
using namespace MAUI;
class MouseScreen : public Screen
{
private:
Label *testLabel;
public:
MouseScreen()
{
MAExtent screenDim = maGetScrSize();
Layout* mainLayout = new Layout( 0, 0, EXTENT_X(screenDim), EXTENT_Y(screenDim), NULL, 1, 3 );
ListBox* mainListBox = new ListBox( 0, 0, 100, 200, mainLayout,
ListBox::LBO_VERTICAL, ListBox::LBA_LINEAR,
true );
mainListBox -> setPaddingLeft( 10 );
mainListBox -> setPaddingRight( 10 );
mainListBox -> setPaddingTop( 10 );
mainListBox -> setPaddingBottom( 10 );
mainListBox -> setBackgroundColor( 900 );
mainLayout -> setBackgroundColor( 300 );
testLabel = new Label( 10, 300, 50, 20, mainLayout );
//testLabel -> addPointerListener( this );
testLabel -> setCaption( "Click me" );
mainLayout -> add( testLabel );
setMain( mainLayout );
}
void pointerPressEvent( MAPoint2d p )
{
if ( testLabel->contains( p.x, p.y ) )
{
printf( "Label clicked" );
}
}
void pointerMoveEvent( MAPoint2d p ) {}
void pointerReleaseEvent( MAPoint2d p ) {}
};
class MouseMoblet : public Moblet
{
public:
MouseMoblet()
{
instance = new MouseScreen();
instance -> show();
}
~MouseMoblet()
{
delete instance;
}
void keyPressEvent(int keyCode, int nativeCode)
{
// todo: handle key presses
printf( "Blah" ); // never occurs when I press the mouse, but other KEYS work
}
void keyReleaseEvent(int keyCode, int nativeCode)
{
// todo: handle key releases
}
private:
MouseScreen *instance;
};
extern "C" int MAMain()
{
Moblet::run(new MouseMoblet());
return 0;
};注意:当前的MoSync UI系统是为非触摸手机设计的,因此它在处理指针事件方面有点做作,但这将在即将发布的版本中得到改进。
至于你是否应该调用父函数,取决于你是否想保持默认行为,目前Screen的默认实现什么都不做。
https://stackoverflow.com/questions/5253485
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