X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/36c9828f702fb504b07968703bcd82f04196070a..7447d53c35249d42128d6243c90998f03882859a:/docs/doxygen/overviews/windowsizing.h diff --git a/docs/doxygen/overviews/windowsizing.h b/docs/doxygen/overviews/windowsizing.h index ed666cb0f1..baf7611eb5 100644 --- a/docs/doxygen/overviews/windowsizing.h +++ b/docs/doxygen/overviews/windowsizing.h @@ -1,99 +1,124 @@ ///////////////////////////////////////////////////////////////////////////// -// Name: windowsizing +// Name: windowsizing.h // Purpose: topic overview // Author: wxWidgets team // RCS-ID: $Id$ -// Licence: wxWindows license +// Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// -/*! - - @page windowsizing_overview Window Sizing Overview - - It can sometimes be confusing to keep track of the various - size-related attributes of a #wxWindow, how they - relate to each other, and how they interact with sizers. This document - will attempt to clear the fog a little, and give some simple - explanations of things. - @b BestSize: The best size of a widget depends on what kind of widget it - is, and usually also on the contents of the widget. For example a - #wxListBox's best size will be calculated based on - how many items it has, up to a certain limit, or a - #wxButton's best size will be calculated based on - its label size, but normally won't be smaller than the platform - default button size (unless a style flag overrides that). Get the - picture? There is a special virtual method in the C++ window classes - called @c DoGetBestSize() that a class needs to override if it - wants to calculate its own best size based on its content. The default - @c DoGetBestSize() is designed for use in container windows, - such as #wxPanel, and works something like this: - - - If the window has a sizer then it is used to calculate the best size. - Otherwise if the window has layout constraints then that is used to calculate the best size. - Otherwise if the window has children then the best size is set to be large enough to show all the children. - Otherwise if there are no children then the window's min size will be used for the best size. - Otherwise if there is no min size set, then the current size is used for the best size. - - - @b MinSize: The min size of a widget is a size that is normally - explicitly set by the programmer either with the @c SetMinSize() - method or the @c SetSizeHints() method. Most controls will also - set the min size to the size given in the control's constructor if a - non-default value is passed. Top-level windows such as - #wxFrame will not allow the user to resize the frame - below the min size. - @b Size: The size of a widget can be explicitly set or fetched with - the @c SetSize() or @c GetSize() methods. This size value - is the size that the widget is currently using on screen and is the - way to change the size of something that is not being managed by a - sizer. - @b ClientSize: The client size represents the widget's area inside - of any borders belonging to the widget and is the area that can be - drawn upon in a @c EVT_PAINT event. If a widget doesn't have a - border then its client size is the same as its size. - @b InitialSize: The initial size of a widget is the size given to - the constructor of the widget, if any. As mentioned above most - controls will also set this size value as the control's min size. If - the size passed to the constructor is the default - @c wxDefaultSize, or if the size is not fully specified (such as - @c wxSize(150,-1)) then most controls will fill in the missing - size components using the best size and will set the initial size of - the control to the resulting size. - @b GetEffectiveMinSize(): (formerly @c GetBestFittingSize) A - blending of the widget's min size and best size, giving precedence to - the min size. For example, if a widget's min size is set to (150, -1) - and the best size is (80, 22) then the best fitting size is (150, - 22). If the min size is (50, 20) then the best fitting size is (50, - 20). This method is what is called by the sizers when determining what - the requirements of each item in the sizer is, and is used for - calculating the overall minimum needs of the sizer. - @b SetInitialSize(size): (formerly @c SetBestFittingSize) - This is a little different than the typical size setters. Rather than - just setting an "initial size" attribute it actually sets the minsize - to the value passed in, blends that value with the best size, and then - sets the size of the widget to be the result. So you can consider this - method to be a "Smart SetSize". This method is what is called by the - constructor of most controls to set the minsize and initial size of - the control. - @b window.Fit(): The @c Fit() method sets the size of a - window to fit around its children. If it has no children then nothing - is done, if it does have children then the size of the window is set - to the window's best size. - @b sizer.Fit(window): This sets the size of the window to be large - enough to accommodate the minimum size needed by the sizer, (along with - a few other constraints...) If the sizer is the one that is assigned - to the window then this should be equivalent to @c window.Fit(). - @b sizer.Layout(): Recalculates the minimum space needed by each - item in the sizer, and then lays out the items within the space - currently allotted to the sizer. - @b window.Layout(): If the window has a sizer then it sets the - space given to the sizer to the current size of the window, which - results in a call to @c sizer.Layout(). If the window has layout - constraints instead of a sizer then the constraints algorithm is - run. The @c Layout() method is what is called by the default - @c EVT_SIZE handler for container windows. - - */ +/** +@page overview_windowsizing Window Sizing Overview + +It can sometimes be confusing to keep track of the various size-related +attributes of a wxWindow, how they relate to each other, and how they interact +with sizers. This document will attempt to clear the fog a little, and give +some simple explanations of things. + +@li @ref overview_windowsizing_glossary +@li @ref overview_windowsizing_func + + +
+ + +@section overview_windowsizing_glossary Glossary + +@li @b "Size": this is the current size of the window and it can be explicitly + set or fetched with the wxWindow::SetSize() or wxWindow::GetSize() methods. + This size value is the size that the widget is currently using on screen and is + the way to change the size of something that is not being managed by a sizer. + +@li @b "Client Size": the client size represents the widget's area inside of any + borders belonging to the widget and is the area that can be drawn upon in a + @c EVT_PAINT event. For wxFrame, the client size also excludes the frame + menu, tool and status bars, if any. If a window doesn't have any border + (and is not a wxFrame with some bars) then its client size is the same as + its size. + +@li @b "Best Size": the best size of a widget depends on what kind of widget it is, + and usually also on the contents of the widget. For example a wxListBox's best + size will be calculated based on how many items it has, up to a certain limit, + or a wxButton's best size will be calculated based on its label size, but + normally won't be smaller than the platform default button size (unless a style + flag overrides that). + There is a special virtual method in the C++ window classes called + wxWindow::DoGetBestSize() that a class can override if it wants to calculate + its own best size based on its content, however notice that usually it is + more convenient to override DoGetBestClientSize(), see below. + +@li @b "Best Client Size": this is simply the client size corresponding to the + best window size. When the fitting size for the given contents is computed, + it will usually be the client size and the size of the borders needs to be + added to obtain the full best size. For this reason, it's preferable to + override DoGetBestClientSize() and let DoGetBestSize() compute the full + best size. + +@li @b "Minimal Size": the minimal size of a widget is a size that is normally explicitly + set by the programmer either with the wxWindow::SetMinSize() method or with the + wxWindow::SetSizeHints() method. + Most controls will also set the minimal size to the size given in the control's + constructor if a non-default value is passed. + Top-level windows such as wxFrame will not allow the user to resize the frame below + the minimal size. + +@li @b "Maximum Size": just like for the minimal size, the maximum size is normally + explicitly set by the programmer with the wxWindow::SetMaxSize() method or + with wxWindow::SetSizeHints(). + Top-level windows such as wxFrame will not allow the user to resize the frame above + the maximum size. + +@li @b "Initial Size": the initial size of a widget is the size given to the + constructor of the widget, if any. + As mentioned above most controls will also set this size value as the control's + minimal size. If the size passed to the constructor is the default ::wxDefaultSize, + or if the size is not fully specified (such as wxSize(150,-1)) then most controls + will fill in the missing size components using the best size and will set the + initial size of the control to the resulting size. + +@li @b "Virtual Size": the virtual size is the size of the potentially viewable + area of the widget. + The virtual size of a widget may be larger than its actual size and in this + case scrollbars will appear to the let the user 'explore' the full contents + of the widget. + See wxScrolled for more info. + + +@section overview_windowsizing_func Functions related to sizing + +@li wxWindow::GetEffectiveMinSize(): returns a blending of the widget's minimal size + and best size, giving precedence to the minimal size. + For example, if a widget's min size is set to (150, -1) and the best size is + (80, 22) then the best fitting size is (150, 22). If the min size is (50, 20) + then the best fitting size is (50, 20). This method is what is called by the + sizers when determining what the requirements of each item in the sizer is, + and is used for calculating the overall minimum needs of the sizer. + +@li wxWindow::SetInitialSize(): this is a little different than the typical size + setters. Rather than just setting an "initial size" attribute it actually sets + the minimal size to the value passed in, blends that value with the best size, + and then sets the size of the widget to be the result. + So you can consider this method to be a "Smart SetSize". This method is what is + called by the constructor of most controls to set the minimal size and the initial + size of the control. + +@li wxWindow::Fit(): this method sets the size of a window to fit around its children. + If it has no children then nothing is done, if it does have children then the size + of the window is set to the window's best size. + +@li wxSizer::Fit(): this sets the size of the window to be large enough to + accommodate the minimum size needed by the sizer, (along with a few other + constraints...). If the sizer is the one that is assigned to the window then + this should be equivalent to wxWindow::Fit(). + +@li wxSizer::Layout(): recalculates the minimum space needed by each item in the + sizer, and then lays out the items within the space currently allotted to the sizer. + +@li wxWindow::Layout(): if the window has a sizer then it sets the space given to + the sizer to the current size of the window, which results in a call to + wxSizer::Layout(). If the window has layout constraints instead of a sizer then + the constraints algorithm is run. The @c Layout() method is what is called by + the default @c EVT_SIZE handler for container windows. + +*/