X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/8fe057828547c22ed7a55350bac2514a80ec4706..bf4d9b2b9be61f4b266ca5b5a302f7d6fbd51a2e:/docs/latex/wx/boxsizer.tex?ds=sidebyside diff --git a/docs/latex/wx/boxsizer.tex b/docs/latex/wx/boxsizer.tex index c58931c47c..42a0cf1104 100644 --- a/docs/latex/wx/boxsizer.tex +++ b/docs/latex/wx/boxsizer.tex @@ -1,43 +1,120 @@ -% -% automatically generated by HelpGen from -% include\wx\sizer.h at 13/Aug/99 22:27:59 -% - - \section{\class{wxBoxSizer}}\label{wxboxsizer} - - -wxBoxSizer - - -\wxheading{Derived from} - -\helpref{wxSizer}{wxsizer} - -\wxheading{Data structures} - +The basic idea behind a box sizer is that windows will most often be laid out in rather +simple basic geomerty, typically in a row or a column or several hierachies of either. + +As an exmaple, we will construct a dialog that will contain a text field at the top and +two buttons at the bottom. This can be seen as a top-hierarchy column with the text at +the top and buttons at the bottom and a low-hierchary row with an OK button to the left +and a Cancel button to the right. In many cases (particulary dialogs under Unix and +normal frames) the main window will be resizable by the user and this change of size +will have to get propagated to its children. In our case, we want the text area to grow +with the dialog, whereas the button shall have a fixed size. In addition, there will be +a thin border around all controls to make the dialog look nice and - to make matter worse - +the buttons shall be centred as the width of the dialog changes. + +It is the unique feature of a box sizer, that it can grow in both directions (height and +width) but can distribute its growth in the main direction (horizontal for a row) {\it unevenly} +among its children. In our example case, the vertical sizer is supposed to propagate all its +height changes to only the text area, not to the button area. This is determined by the {\it option} parameter +when adding a window (or another sizer) to a sizer. It is interpreted +as a weight factor, i.e. it can be zero, indicating that the window may not be resized +at all, or above zero. If several windows have a value above zero, the value is interpreted +relative to the sum of all weight factors of the sizer, so when adding two windows with +a value of 1, they will both get resized equally much and each half as much as the sizer +owning them. Then what do we do when a column sizer changes its width? This behaviour is +controlled by {\it flags} (the second parameter of the Add() function): Zero or no flag +indicates that the window will preserve it's original size, wxGROW flag (same as wxEXPAND) +forces the window to grow with the sizer, and wxSHAPED flag tells the window to change it's +size proportionally, preserving original aspect ratio. When wxGROW flag is not used, +the item can be aligned within available space. wxALIGN\_LEFT, wxALIGN\_TOP, wxALIGN\_RIGHT, +wxALIGN\_BOTTOM, wxALIGN\_CENTER\_HORIZONTAL and wxALIGN\_CENTER\_VERTICAL do what they say. +wxALIGN\_CENTRE (same as wxALIGN\_CENTER) is defined as (wxALIGN\_CENTER\_HORIZONTAL | +wxALIGN\_CENTER\_VERTICAL). Default alignment is wxALIGN\_LEFT | wxALIGN\_TOP. + +As mentioned above, any window belonging to a sizer may have border, and it can be specified +which of the four sides may have this border, using the wxTOP, wxLEFT, wxRIGHT and wxBOTTOM +constants or wxALL for all directions (and you may also use wxNORTH, wxWEST etc instead). These +flags can be used in combintaion with the alignement flags above as the second paramter of the +Add() method using the binary or operator |. The sizer of the border also must be made known, +and it is the third parameter in the Add() method. This means, that the entire behaviour of +a sizer and its children can be controlled by the three parameters of the Add() method. + +\begin{verbatim} +// we want to get a dialog that is stretchable because it +// has a text ctrl at the top and two buttons at the bottom + +MyDialog::MyDialog(wxFrame *parent, wxWindowID id, const wxString &title ) : + wxDialog( parent, id, title, wxDefaultPosition, wxDefaultSize, wxDIALOG_STYLE | wxRESIZE_BORDER ) +{ + wxBoxSizer *topsizer = new wxBoxSizer( wxVERTICAL ); + + // create text ctrl with minimal size 100x60 + topsizer->Add( + new wxTextCtrl( this, -1, "My text.", wxDefaultPosition, wxSize(100,60), wxTE_MULTILINE), + 1, // make vertically stretchable + wxEXPAND | // make horizontally stretchable + wxALL, // and make border all around + 10 ); // set border width to 10 + + + wxBoxSizer *button_sizer = new wxBoxSizer( wxHORIZONTAL ); + button_sizer->Add( + new wxButton( this, wxID_OK, "OK" ), + 0, // make horizontally unstretchable + wxALL, // make border all around (implicit top alignment) + 10 ); // set border width to 10 + button_sizer->Add( + new wxButton( this, wxID_CANCEL, "Cancel" ), + 0, // make horizontally unstretchable + wxALL, // make border all around (implicit top alignment) + 10 ); // set border width to 10 + + topsizer->Add( + button_sizer, + 0, // make vertically unstretchable + wxALIGN_CENTER ); // no border and centre horizontally + + SetAutoLayout( TRUE ); // tell dialog to use sizer + SetSizer( topsizer ); // actually set the sizer + + topsizer->Fit( this ); // set size to minimum size as calculated by the sizer + topsizer->SetSizeHints( this ); // set size hints to honour mininum size } +\end{verbatim} -\latexignore{\rtfignore{\wxheading{Members}}} +\wxheading{Derived from} +\helpref{wxSizer}{wxsizer}\\ +\helpref{wxObject}{wxobject} \membersection{wxBoxSizer::wxBoxSizer}\label{wxboxsizerwxboxsizer} \func{}{wxBoxSizer}{\param{int }{orient}} +Constructor for a wxBoxSizer. {\it orient} may be either of wxVERTICAL +or wxHORIZONTAL for creating either a column sizer or a row sizer. \membersection{wxBoxSizer::RecalcSizes}\label{wxboxsizerrecalcsizes} \func{void}{RecalcSizes}{\void} +Implements the calculation of a box sizer's dimensions and then sets +the size of its its children (calling \helpref{wxWindow::SetSize}{wxwindowsetsize} +if the child is a window). It is used internally only and must not be called +by the users. Documented for information. \membersection{wxBoxSizer::CalcMin}\label{wxboxsizercalcmin} \func{wxSize}{CalcMin}{\void} +Implements the calculation of a box sizer's minimal. It is used internally +only and must not be called by the users. Documented for information. \membersection{wxBoxSizer::GetOrientation}\label{wxboxsizergetorientation} \func{int}{GetOrientation}{\void} +Returns the orientation of the boxsizer, either of wxVERTICAL +or wxHORIZONTAL. +