CListbox Class Reference

Description

Listbox widget.

Definition at line 427 of file ui_widgets.H.

#include "ui_widgets.H"

Inheritance diagram for CListbox:

Public Member Functions
Setup ...
void	SetMode (EListboxMode _mode, int _itemHeight, int _itemGap=1)
	'itemHeight' == 0 indicates variable-height items (Note: presently much worse performance than fixed-height); implicitly deletes all items.
void	SetFormat (TTF_Font *_font, int _hAlign=-1, TColor colGrid=BLACK, TColor _colLabel=WHITE, TColor _colBack=DARK_DARK_GREY, TColor _colLabelSelected=WHITE, TColor _colBackSelected=GREY, TColor _colLabelSpecial=WHITE, TColor _colBackSpecial=DARK_GREY)
	Except 'colGrid', all parameters set here are only read in 'RenderItem' & can be ommited (or re-interpreted) if a custom render function is defined. 'colGrid' is the general background color which can also be set via 'CCanvas::SetColors'.
void	SetArea (SDL_Rect _area)
Content management ...
void	Clear ()
void	SetItems (int _items)
int	GetItems ()
void	SetItem (int idx, const char *_text, const char *_iconName=NULL, bool _isSpecial=false, void *data=NULL)
void	SetItem (int idx, const char *_text, SDL_Surface *_iconSurf, bool _isSpecial=false, void *data=NULL)
CListboxItem *	GetItem (int idx)
int	GetItemHeight ()
int	GetItemLabelWidth (int idx)
	Retrieve the label (net) width of an item (e.g. to optimize geometry).
SDL_Rect	GetItemRect (int idx)
	Get the area of an item.
void	ScrollTo (int idx, int vAlign=-1)
void	ScrollIn (int idx)
Content selection ...
void	SelectItem (int idx, bool _isSelected=true)
	(De-)Select item (for 'lmSelectSingle', 'lmSelectAny')
void	SelectAll (bool _isSelected=true)
	Select all items (for 'lmSelectAny')
void	SelectNone ()
	Deselect all items (for 'lmSelectSingle', 'lmSelectAny')
bool	MouseDown ()
	Determine whether the listbox is currently dragged by the mouse. In this case, calling a Select...() method may interfere with the user interaction and should be avoided.
Returning results ...
bool	ItemIsSelected (int idx)
int	GetSelectedItem ()
virtual void	OnPushed (int idx, bool longPush)
void	SetCbPushed (FCbListboxPushed *_cbPushed, void *_data=NULL)
Callbacks...
virtual void	Render (SDL_Renderer *ren)
	Render this widget. More...
virtual bool	HandleEvent (SDL_Event *ev)
	Handle wiping/scrolling events, if virtual area is wider (higher) than physical area.
Public Member Functions inherited from CCanvas
void	SetDefaults ()
	Set default colors and scrollbar appearance.
void	SetColors (TColor _backColor=BLACK, TColor _scrollbarColor=ToColor(255, 255, 255, 32))
void	SetScrollbarWidth (int width=8)
void	SetArea (SDL_Rect _area)
void	SetVirtArea (SDL_Rect r)
	Set the virtual area in screen coordinates; ('virtArea' == 'area' represents no displacement); The areas of all subwidgets are relative to the virtual area.
SDL_Rect *	GetVirtArea ()
void	MoveVirtArea (int toX0, int toY0)
void	LimitVirtArea (SDL_Rect *r=NULL)
	Move virtual area (or 'r') so that the visible area is completely filled.
void	ScrollTo (SDL_Rect r, int hAlign=0, int vAlign=-1)
	Scroll such that 'r' is aligned according to '[vh]Align' (-1 = left/up, 0 = center, 1 = right/down).
void	ScrollIn (SDL_Rect r)
	Scroll just enough to get 'r' fully visible.
void	WidgetToScreenCoords (int *x, int *y)
void	ScreenToWidgetCoords (int *x, int *y)
void	AddWidget (CWidget *widget)
void	DelWidget (CWidget *widget)
void	DelAllWidgets ()
bool	IsVisible (SDL_Rect *r)
bool	IsVisible (CWidget *w)
Public Member Functions inherited from CWidget
void	Set (SDL_Surface *_surf, int x0, int y0)
void	SetArea (SDL_Rect _area)
SDL_Rect *	GetArea ()
class CScreen *	GetScreen ()
bool	IsOnScreen (class CScreen *_screen)
class CCanvas *	GetCanvas ()
void	LocalToScreenCoords (int *x, int *y)
void	ScreenToLocalCoords (int *x, int *y)
void	GetMouseEventPos (SDL_Event *ev, int *x, int *y)
void	SetSurface (SDL_Surface *_surface)
	Set the static surface to display. The caller stays owner of surface, must not delete it as long as it is set here. The surface dimensions must match 'area'.
virtual SDL_Surface *	GetSurface ()
	Get an up-to-date surface or 'NULL' if none is available.
void	GetRenderArea (SDL_Rect *ra)
	Transpose 'area' to the current screen coordinates to be passed to all SDL rendering functions.
virtual SDL_Texture *	GetTexture ()
	Return an up-to-date texture. More...
void	SetTextureBlendMode (SDL_BlendMode _sdlBlendMode)
	Set the blend mode for the texture created by the default implementation of GetTexture(). The default is SDL_BLENDMODE_NONE.
void	ClearTexture ()
	Clear the internally cached texture object to save memory.

Protected Member Functions
Rendering ...
virtual SDL_Surface *	RenderItem (CListboxItem *item, int idx, SDL_Surface *surf)
	Render a list box item to an SDL surface and return it. More...
Protected Member Functions inherited from CWidget
void	ChangedSurface ()
	Mark (only) the surface as changed to trigger a redrawing at next occasion.
void	Changed ()
	Anything may have changed: Trigger a redrawing at next occasion.

Change management ...
void	ChangedItems (int idx, int num=1)
	Must be called if items changed and SetItem() was not called.
void	ChangedSetup ()
void	Changed ()

Member Function Documentation

Render()

virtual void CListbox::Render ( SDL_Renderer *  ren )

virtual

Render this widget.

The default implementation uses the 'GetTexture()' method above. By overriding this method it is possible to define widgets with a custom SDL rendering procedure, which may be more efficient than preparing a single texture containing the complete widget.

It is allowed to pass 'ren == NULL', in which case all textures and internal data structures are (re-)calculated, but nothing is actually rendered.

Reimplemented from CCanvas.

Reimplemented in CMenu.

RenderItem()

virtual SDL_Surface* CListbox::RenderItem ( CListboxItem *  item, int  idx, SDL_Surface *  surf  )

protectedvirtual

Render a list box item to an SDL surface and return it.

This method may be overriden to implement a custom look of the items. The default implementation renders an icon and text (or one of both) as defined by CListboxItem::SetLabe() according the settings given by SetFormat() and interprets CListboxItem::isSpecial(). The dimensions of the returned surface must match 'area.w' and 'itemHeight' (if >= 0). If 'itemHeight' == 0, the height is arbitrary and the layout will be adapted accordingly. The caller becomes owner of the returned surface. 'surf' is the previous surface which can be reused. If it is not NULL, it must be free'd or reused.

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The documentation for this class was generated from the following file:

• wallclock/ui_widgets.H