Version: 2.9.4
Public Member Functions | Static Public Member Functions
wxRendererNative Class Reference

#include </home/zeitlin/src/wx/github/interface/wx/renderer.h>

Inheritance diagram for wxRendererNative:

Detailed Description

First, a brief introduction to wxRendererNative and why it is needed.

Usually wxWidgets uses the underlying low level GUI system to draw all the controls - this is what we mean when we say that it is a "native" framework. However not all controls exist under all (or even any) platforms and in this case wxWidgets provides a default, generic, implementation of them written in wxWidgets itself.

These controls don't have the native appearance if only the standard line drawing and other graphics primitives are used, because the native appearance is different under different platforms while the lines are always drawn in the same way.

This is why we have renderers: wxRendererNative is a class which virtualizes the drawing, i.e. it abstracts the drawing operations and allows you to draw say, a button, without caring about exactly how this is done. Of course, as we can draw the button differently in different renderers, this also allows us to emulate the native look and feel.

So the renderers work by exposing a large set of high-level drawing functions which are used by the generic controls. There is always a default global renderer but it may be changed or extended by the user, see Render Sample.

All drawing functions take some standard parameters:

Note that each drawing function restores the wxDC attributes if it changes them, so it is safe to assume that the same pen, brush and colours that were active before the call to this function are still in effect after it.

Library:  wxCore
Category:  Graphics Device Interface (GDI)

Public Member Functions

virtual ~wxRendererNative ()
 Virtual destructor as for any base class.
virtual void DrawCheckBox (wxWindow *win, wxDC &dc, const wxRect &rect, int flags=0)=0
 Draw a check box.
virtual void DrawComboBoxDropButton (wxWindow *win, wxDC &dc, const wxRect &rect, int flags=0)=0
 Draw a button like the one used by wxComboBox to show a drop down window.
virtual void DrawDropArrow (wxWindow *win, wxDC &dc, const wxRect &rect, int flags=0)=0
 Draw a drop down arrow that is suitable for use outside a combo box.
virtual void DrawFocusRect (wxWindow *win, wxDC &dc, const wxRect &rect, int flags=0)=0
 Draw a focus rectangle using the specified rectangle.
virtual int DrawHeaderButton (wxWindow *win, wxDC &dc, const wxRect &rect, int flags=0, wxHeaderSortIconType sortArrow=wxHDR_SORT_ICON_NONE, wxHeaderButtonParams *params=NULL)=0
 Draw the header control button (used, for example, by wxListCtrl).
virtual int DrawHeaderButtonContents (wxWindow *win, wxDC &dc, const wxRect &rect, int flags=0, wxHeaderSortIconType sortArrow=wxHDR_SORT_ICON_NONE, wxHeaderButtonParams *params=NULL)=0
 Draw the contents of a header control button (label, sort arrows, etc.).
virtual void DrawItemSelectionRect (wxWindow *win, wxDC &dc, const wxRect &rect, int flags=0)=0
 Draw a selection rectangle underneath the text as used e.g.
virtual void DrawPushButton (wxWindow *win, wxDC &dc, const wxRect &rect, int flags=0)=0
 Draw a blank push button that looks very similar to wxButton.
virtual void DrawSplitterBorder (wxWindow *win, wxDC &dc, const wxRect &rect, int flags=0)=0
 Draw the border for sash window: this border must be such that the sash drawn by DrawSplitterSash() blends into it well.
virtual void DrawSplitterSash (wxWindow *win, wxDC &dc, const wxSize &size, wxCoord position, wxOrientation orient, int flags=0)=0
 Draw a sash.
virtual void DrawTreeItemButton (wxWindow *win, wxDC &dc, const wxRect &rect, int flags=0)=0
 Draw the expanded/collapsed icon for a tree control item.
virtual void DrawChoice (wxWindow *win, wxDC &dc, const wxRect &rect, int flags=0)=0
 Draw a native wxChoice.
virtual void DrawComboBox (wxWindow *win, wxDC &dc, const wxRect &rect, int flags=0)=0
 Draw a native wxComboBox.
virtual void DrawTextCtrl (wxWindow *win, wxDC &dc, const wxRect &rect, int flags=0)=0
 Draw a native wxTextCtrl frame.
virtual void DrawRadioBitmap (wxWindow *win, wxDC &dc, const wxRect &rect, int flags=0)=0
 Draw a native wxRadioButton bitmap.
virtual void DrawTitleBarBitmap (wxWindow *win, wxDC &dc, const wxRect &rect, wxTitleBarButton button, int flags=0)=0
 Draw a title bar button in the given state.
virtual wxSize GetCheckBoxSize (wxWindow *win)=0
 Returns the size of a check box.
virtual int GetHeaderButtonHeight (wxWindow *win)=0
 Returns the height of a header button, either a fixed platform height if available, or a generic height based on the win window's font.
virtual int GetHeaderButtonMargin (wxWindow *win)=0
 Returns the horizontal margin on the left and right sides of header button's label.
virtual wxSplitterRenderParams GetSplitterParams (const wxWindow *win)=0
 Get the splitter parameters, see wxSplitterRenderParams.
virtual wxRendererVersion GetVersion () const =0
 This function is used for version checking: Load() refuses to load any shared libraries implementing an older or incompatible version.

Static Public Member Functions

static wxRendererNativeGet ()
 Return the currently used renderer.
static wxRendererNativeGetDefault ()
 Return the default (native) implementation for this platform -- this is also the one used by default but this may be changed by calling Set() in which case the return value of this method may be different from the return value of Get().
static wxRendererNativeGetGeneric ()
 Return the generic implementation of the renderer.
static wxRendererNativeLoad (const wxString &name)
 Load the renderer from the specified DLL, the returned pointer must be deleted by caller if not NULL when it is not used any more.
static wxRendererNativeSet (wxRendererNative *renderer)
 Set the renderer to use, passing NULL reverts to using the default renderer (the global renderer must always exist).

List of all members.


Constructor & Destructor Documentation

virtual wxRendererNative::~wxRendererNative ( ) [virtual]

Virtual destructor as for any base class.


Member Function Documentation

virtual void wxRendererNative::DrawCheckBox ( wxWindow win,
wxDC dc,
const wxRect rect,
int  flags = 0 
) [pure virtual]

Draw a check box.

flags may have the wxCONTROL_CHECKED, wxCONTROL_CURRENT or wxCONTROL_UNDETERMINED bit set, see wxCONTROL_FLAGS.

Implemented in wxDelegateRendererNative.

virtual void wxRendererNative::DrawChoice ( wxWindow win,
wxDC dc,
const wxRect rect,
int  flags = 0 
) [pure virtual]

Draw a native wxChoice.

virtual void wxRendererNative::DrawComboBox ( wxWindow win,
wxDC dc,
const wxRect rect,
int  flags = 0 
) [pure virtual]

Draw a native wxComboBox.

virtual void wxRendererNative::DrawComboBoxDropButton ( wxWindow win,
wxDC dc,
const wxRect rect,
int  flags = 0 
) [pure virtual]

Draw a button like the one used by wxComboBox to show a drop down window.

The usual appearance is a downwards pointing arrow.

flags may have the wxCONTROL_PRESSED or wxCONTROL_CURRENT bit set, see wxCONTROL_FLAGS.

Implemented in wxDelegateRendererNative.

virtual void wxRendererNative::DrawDropArrow ( wxWindow win,
wxDC dc,
const wxRect rect,
int  flags = 0 
) [pure virtual]

Draw a drop down arrow that is suitable for use outside a combo box.

Arrow will have transparent background.

rect is not entirely filled by the arrow. Instead, you should use bounding rectangle of a drop down button which arrow matches the size you need.

flags may have the wxCONTROL_PRESSED or wxCONTROL_CURRENT bit set, see wxCONTROL_FLAGS.

Implemented in wxDelegateRendererNative.

virtual void wxRendererNative::DrawFocusRect ( wxWindow win,
wxDC dc,
const wxRect rect,
int  flags = 0 
) [pure virtual]

Draw a focus rectangle using the specified rectangle.

wxListCtrl.

The only supported flags is wxCONTROL_SELECTED for items which are selected. see wxCONTROL_FLAGS.

Implemented in wxDelegateRendererNative.

virtual int wxRendererNative::DrawHeaderButton ( wxWindow win,
wxDC dc,
const wxRect rect,
int  flags = 0,
wxHeaderSortIconType  sortArrow = wxHDR_SORT_ICON_NONE,
wxHeaderButtonParams params = NULL 
) [pure virtual]

Draw the header control button (used, for example, by wxListCtrl).

Depending on platforms the flags parameter may support the wxCONTROL_SELECTED wxCONTROL_DISABLED and wxCONTROL_CURRENT bits, see wxCONTROL_FLAGS.

Returns:
The optimal width to contain the unabbreviated label text or bitmap, the sort arrow if present, and internal margins.

Implemented in wxDelegateRendererNative.

virtual int wxRendererNative::DrawHeaderButtonContents ( wxWindow win,
wxDC dc,
const wxRect rect,
int  flags = 0,
wxHeaderSortIconType  sortArrow = wxHDR_SORT_ICON_NONE,
wxHeaderButtonParams params = NULL 
) [pure virtual]

Draw the contents of a header control button (label, sort arrows, etc.).

This function is normally only called by DrawHeaderButton().

Depending on platforms the flags parameter may support the wxCONTROL_SELECTED wxCONTROL_DISABLED and wxCONTROL_CURRENT bits, see wxCONTROL_FLAGS.

Returns:
The optimal width to contain the unabbreviated label text or bitmap, the sort arrow if present, and internal margins.

Implemented in wxDelegateRendererNative.

virtual void wxRendererNative::DrawItemSelectionRect ( wxWindow win,
wxDC dc,
const wxRect rect,
int  flags = 0 
) [pure virtual]

Draw a selection rectangle underneath the text as used e.g.

in a wxListCtrl.

The supported flags are wxCONTROL_SELECTED for items which are selected (e.g. often a blue rectangle) and wxCONTROL_CURRENT for the item that has the focus (often a dotted line around the item's text). wxCONTROL_FOCUSED may be used to indicate if the control has the focus (otherwise the selection rectangle is e.g. often grey and not blue). This may be ignored by the renderer or deduced by the code directly from the win.

Implemented in wxDelegateRendererNative.

virtual void wxRendererNative::DrawPushButton ( wxWindow win,
wxDC dc,
const wxRect rect,
int  flags = 0 
) [pure virtual]

Draw a blank push button that looks very similar to wxButton.

flags may have the wxCONTROL_PRESSED, wxCONTROL_CURRENT or wxCONTROL_ISDEFAULT bit set, see wxCONTROL_FLAGS.

Implemented in wxDelegateRendererNative.

virtual void wxRendererNative::DrawRadioBitmap ( wxWindow win,
wxDC dc,
const wxRect rect,
int  flags = 0 
) [pure virtual]

Draw a native wxRadioButton bitmap.

virtual void wxRendererNative::DrawSplitterBorder ( wxWindow win,
wxDC dc,
const wxRect rect,
int  flags = 0 
) [pure virtual]

Draw the border for sash window: this border must be such that the sash drawn by DrawSplitterSash() blends into it well.

Implemented in wxDelegateRendererNative.

virtual void wxRendererNative::DrawSplitterSash ( wxWindow win,
wxDC dc,
const wxSize size,
wxCoord  position,
wxOrientation  orient,
int  flags = 0 
) [pure virtual]

Draw a sash.

The orient parameter defines whether the sash should be vertical or horizontal and how the position should be interpreted.

Implemented in wxDelegateRendererNative.

virtual void wxRendererNative::DrawTextCtrl ( wxWindow win,
wxDC dc,
const wxRect rect,
int  flags = 0 
) [pure virtual]

Draw a native wxTextCtrl frame.

virtual void wxRendererNative::DrawTitleBarBitmap ( wxWindow win,
wxDC dc,
const wxRect rect,
wxTitleBarButton  button,
int  flags = 0 
) [pure virtual]

Draw a title bar button in the given state.

This function is currently only available under MSW and OS X (and only for wxTITLEBAR_BUTTON_CLOSE under the latter), its best replacement for the other platforms is to use wxArtProvider to retrieve the bitmaps for wxART_HELP and wxART_CLOSE (but not any other title bar buttons and not for any state but normal, i.e. not pressed and not current one).

The presence of this function is indicated by wxHAS_DRAW_TITLE_BAR_BITMAP symbol being defined.

Also notice that PNG handler must be enabled using wxImage::AddHandler() to use this function under OS X currently as the bitmaps are embedded in the library itself in PNG format.

Since:
2.9.1
virtual void wxRendererNative::DrawTreeItemButton ( wxWindow win,
wxDC dc,
const wxRect rect,
int  flags = 0 
) [pure virtual]

Draw the expanded/collapsed icon for a tree control item.

To draw an expanded button the flags parameter must contain wxCONTROL_EXPANDED bit, see wxCONTROL_FLAGS.

Implemented in wxDelegateRendererNative.

static wxRendererNative& wxRendererNative::Get ( ) [static]

Return the currently used renderer.

virtual wxSize wxRendererNative::GetCheckBoxSize ( wxWindow win) [pure virtual]

Returns the size of a check box.

The win parameter is not used currently and can be NULL.

Implemented in wxDelegateRendererNative.

static wxRendererNative& wxRendererNative::GetDefault ( ) [static]

Return the default (native) implementation for this platform -- this is also the one used by default but this may be changed by calling Set() in which case the return value of this method may be different from the return value of Get().

static wxRendererNative& wxRendererNative::GetGeneric ( ) [static]

Return the generic implementation of the renderer.

Under some platforms, this is the default renderer implementation, others have platform-specific default renderer which can be retrieved by calling GetDefault().

virtual int wxRendererNative::GetHeaderButtonHeight ( wxWindow win) [pure virtual]

Returns the height of a header button, either a fixed platform height if available, or a generic height based on the win window's font.

Implemented in wxDelegateRendererNative.

virtual int wxRendererNative::GetHeaderButtonMargin ( wxWindow win) [pure virtual]

Returns the horizontal margin on the left and right sides of header button's label.

Since:
2.9.2

Implemented in wxDelegateRendererNative.

virtual wxSplitterRenderParams wxRendererNative::GetSplitterParams ( const wxWindow win) [pure virtual]

Get the splitter parameters, see wxSplitterRenderParams.

The win parameter should be a wxSplitterWindow.

Implemented in wxDelegateRendererNative.

virtual wxRendererVersion wxRendererNative::GetVersion ( ) const [pure virtual]

This function is used for version checking: Load() refuses to load any shared libraries implementing an older or incompatible version.

注意:
The implementation of this method is always the same in all renderers (simply construct wxRendererVersion using the wxRendererVersion::Current_XXX values), but it has to be in the derived, not base, class, to detect mismatches between the renderers versions and so you have to implement it anew in all renderers.

Implemented in wxDelegateRendererNative.

static wxRendererNative* wxRendererNative::Load ( const wxString name) [static]

Load the renderer from the specified DLL, the returned pointer must be deleted by caller if not NULL when it is not used any more.

The name should be just the base name of the renderer and not the full name of the DLL file which is constructed differently (using wxDynamicLibrary::CanonicalizePluginName()) on different systems.

static wxRendererNative* wxRendererNative::Set ( wxRendererNative renderer) [static]

Set the renderer to use, passing NULL reverts to using the default renderer (the global renderer must always exist).

Return the previous renderer used with Set() or NULL if none.

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