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自定义控件: 容器控件(三)

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Article Metadata

代码示例
文章
dougcn 在 06 Jul 2008 创建
最后由 hamishwillee 在 30 May 2013 编辑
ID CS000861 Creation date March 25, 2008
Platform S60 3rd Edition, FP1 Tested on devices Nokia N95
Category Symbian C++ Subcategory UI


Keywords (APIs, classes, methods, functions): CCoeControl, TResourceReader, CCoeControlArray

Contents

概述

这个代码片段演示如何创建一个拥有自定义控件的容器控件。例子演示如何用一个矩形框聚焦第一个部件及如何改变焦点。

本例扩展已存代码片段自定义控件: 定义(一); 容器控件存储其控件到CCoeControlArray中。

头文件

class CMyContainerControl : public CCoeControl
{
public:
static CMyContainerControl* NewL(const TRect& aRect);
static CMyContainerControl* NewLC(const TRect& aRect);
virtual ~CMyContainerControl();
 
private: // from CCoeControl
void Draw(const TRect& aRect) const;
void SizeChanged();
 
public: // own methods
// NOTE: Transfer ownership to CMyContainerControl
void AddControlL(CCoeControl* aControl,TInt aControlId);
void UpdateControls();
 
private: // own methods
CMyContainerControl();
void ConstructL(const TRect& aRect);
};


源代码

CMyContainerControl* CMyContainerControl::NewL(const TRect& aRect)
{
CMyContainerControl* self = CMyContainerControl::NewLC(aRect);
CleanupStack::Pop(self);
return self;
}
 
CMyContainerControl* CMyContainerControl::NewLC(const TRect& aRect)
{
CMyContainerControl* self = new(ELeave) CMyContainerControl();
CleanupStack::PushL(self);
self->ConstructL(aRect);
return self;
}
 
CMyContainerControl::CMyContainerControl()
{
}
 
CMyContainerControl::~CMyContainerControl()
{
}
 
void CMyContainerControl::ConstructL(const TRect& aRect)
{
// No parent owner, so create an own window
CreateWindowL();
 
// Initialize component array
InitComponentArrayL();
 
SetRect(aRect);
 
ActivateL();
}
 
void CMyContainerControl::SizeChanged()
{
UpdateControls();
}
 
void CMyContainerControl::UpdateControls()
{
TPoint position;
 
// Goes through all components of this container control
CCoeControlArray::TCursor cursor = Components().Begin();
CCoeControl* ctrl = NULL;
while ((ctrl = cursor.Control<CCoeControl>()) != NULL)
{
// If control is not visible, do not set it's position
if (!ctrl->IsVisible())
{
cursor.Next();
continue;
}
 
// Set position
ctrl->SetPosition(position);
 
// Set size
TSize size = ctrl->MinimumSize();
size.SetSize(Rect().Width(),size.iHeight);
ctrl->SetSize(size);
 
// Calculate position
position.iY += size.iHeight;
 
// Does control fit to view?
if (position.iY >= Rect().iBr.iY)
{
ctrl->MakeVisible(EFalse);
}
else
{
ctrl->MakeVisible(ETrue);
}
 
cursor.Next();
}
}
 
void CMyContainerControl::Draw(const TRect& /*aRect*/) const
{
CWindowGc& gc = SystemGc();
gc.SetBrushColor(KRgbBlack);
gc.Clear(Rect());
}
 
void CMyContainerControl::AddControlL(CCoeControl* aControl,TInt aControlId)
{
// NOTE: Transfer ownership of CCoeControl to CMyContainerControl
// Add control into container control
Components().AppendLC(aControl,aControlId);
CleanupStack::Pop(aControl);
 
// Focus first component
if (Components().Count()==1)
{
aControl->SetFocus(ETrue);
}
 
// Update control's position
UpdateControls();
}

SizeChanged函数

CMyContainerControl的大小改变时(例如: 当SetRect()被调用时),部件的位置必须再次计算。

void CMyContainerControl::SizeChanged()
{
// Sets new position of the components
UpdateControls();
}

聚焦部件

CMyControl部件做如下变更:

  • CMyControl::Draw()必须调用DrawFocusFrame()以便绘制焦点矩形
  • CMyControl::DrawFocusFrame()是一个新方法,在其中绘制焦点框
void CMyControl::Draw(const TRect& aRect) const
{
CWindowGc& gc = SystemGc();
gc.SetBrushColor(KRgbBlue);
gc.Clear(Rect());
 
DrawFocusFrame(aRect);
}
 
void CMyControl::DrawFocusFrame(const TRect& aRect) const
{
// Nothing to draw if not focused
if ( IsFocused() == EFalse )
return;
 
// Prep for draw
CWindowGc& gc = SystemGc();
gc.SetPenStyle( CGraphicsContext::ESolidPen );
gc.SetPenSize( TSize(KFocusFrameWidth,KFocusFrameWidth) );
gc.SetBrushStyle( CGraphicsContext::ENullBrush );
gc.SetPenColor( KRgbDarkGray );
 
// Draw the rounded rectangle
gc.DrawRoundRect( aRect, TSize( KFrameRoundRadius, KFrameRoundRadius ) );
}

后置条件

CMyContainerControl容器在列表中有一些CMyControl自定义控件。

参见

自定义控件系列:

This page was last modified on 30 May 2013, at 04:37.
57 page views in the last 30 days.

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