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wxSizer

wxSizer is the abstract base class used for laying out subwindows in a window. You cannot use wxSizer directly; instead, you'll have to use wxBoxSizer or wxStaticBoxSizer.

The layout algorithm used by sizers in wxWindows closely related to layout in other GUI toolkits, such as Java's AWT, the GTK toolkit or the Qt toolkit. It is based upon the idea of the individual subwindows reporting their minimal required size and their ability to get stretched if the size of the parent window has changed. This will most often mean, that the programmer does not set the original size of the dialog in the beginning, rather the top-most sizer will get queried and it will then query its children. Its children can be normal windows or other sizers, so that a hierachy of sizer can be constructed. Note that sizer are not derived from wxWindows and thus do not interfere with tab ordering and require very little resources compared to a real window on screen.

What makes sizers so well fitted for use in wxWindows, is the fact that every control reports its own minimal size and the algorithm can handle differences in font sizes or different window (dialog item) sizes on different platforms without problems. If e.g. the standard font as well as the overall design of Motif widgets requires more space than on Windows, the intial dialog size will automatically be bigger on Motif than on Windows.

wxPython note: If you wish to create a sizer class in wxPython you should derive the class from wxPySizer in order to get Python-aware capabilities for the various virtual methods.

Derived from

wxObject

Members

wxSizer::wxSizer
wxSizer::~wxSizer
wxSizer::Add
wxSizer::Prepend
wxSizer::Remove
wxSizer::SetDimension
wxSizer::GetSize
wxSizer::GetPosition
wxSizer::GetMinSize
wxSizer::RecalcSizes
wxSizer::CalcMin
wxSizer::Layout
wxSizer::Fit
wxSizer::SetSizeHints


wxSizer::wxSizer

wxSizer()

The constructor. Note that wxSizer is an abstract base class and may not be instantiated.


wxSizer::~wxSizer

~wxSizer()

The destructor.


wxSizer::Add

void Add(wxWindow* window, int option = 0,int flag = 0, int border = 0, wxObject* userData = NULL)

void Add(wxSizer* sizer, int option = 0, int flag = 0, int border = 0, wxObject* userData = NULL)

void Add(int width, int height, int option = 0, int flag = 0, int border = 0, wxObject* userData = NULL)

Adds the window to the sizer. As wxSizer itself is an abstract class, the parameters have no meaning in the wxSizer class itself, but as there currently is only one class deriving directly from wxSizer and this class does not override these methods, the meaning of the paramters is described here:

window

sizer

width and height

option

flag

border

userData


wxSizer::Prepend

void Prepend(wxWindow* window, int option = 0, int flag = 0, int border = 0, wxObject* userData = NULL)

void Prepend(wxSizer* sizer, int option = 0, int flag = 0, int border = 0, wxObject* userData = NULL)

void Prepend(int width, int height, int option = 0, int flag = 0, int border= 0, wxObject* userData = NULL)

Same as wxSizer::Add, but prepends the items to the beginning of the list of items (windows, subsizers or spaces) owned by this sizer.


wxSizer::Remove

bool Remove(wxWindow* window)

bool Remove(wxSizer* sizer)

bool Remove(int nth)

Removes a child from the sizer. window is the window to be removed, sizer the equivalent sizer and nth is the position of the child in the sizer, typically 0 for the first item. This method does not cause any layout or resizing to take place and does not delete the window itself. Call wxSizer::Layout for updating the layout "on screen" after removing a child fom the sizer.

Returns TRUE if the child item was found and removed, FALSE otherwise.


wxSizer::SetDimension

void SetDimension(int x, int y, int width, int height)

Call this to force the sizer to take the given dimension and thus force the items owned by the sizer to resize themselves according to the rules defined by the paramater in the wxSizer::Add and wxSizer::Prepend methods.


wxSizer::GetSize

wxSize GetSize()

Returns the current size of the sizer.


wxSizer::GetPosition

wxPoint GetPosition()

Returns the current position of the sizer.


wxSizer::GetMinSize

wxSize GetMinSize()

Returns the minimal size of the sizer.


wxSizer::RecalcSizes

void RecalcSizes()

This method is abstract and has to be overwritten by any derived class. Here, the sizer will do the actual calculation of its children's positions and sizes.


wxSizer::CalcMin

wxSize CalcMin()

This method is abstract and has to be overwritten by any derived class. Here, the sizer will do the actual calculation of its children minimal sizes.


wxSizer::Layout

void Layout()

Call this to force laying out the children anew, e.g. after having added a child to or removed a child (window, other sizer or space) from the sizer while keeping the current dimension.


wxSizer::Fit

void Fit(wxWindow* window)

Tell the sizer to resize the window to match the sizer's minimal size. This is commonly done in the constructor of the window itself, see sample in the description of wxBoxSizer.


wxSizer::SetSizeHints

void SetSizeHints(wxWindow* window)

Tell the sizer to set the minimal size of the window to match the sizer's minimal size. This is commonly done in the constructor of the window itself, see sample in the description of wxBoxSizer if the window is resizable (as many dialogs under Unix and frames on probably all platforms).