diff --git a/docs/doxygen/overviews/windowsizing.h b/docs/doxygen/overviews/windowsizing.h index 5b73d456e0..7c05e6c388 100644 --- a/docs/doxygen/overviews/windowsizing.h +++ b/docs/doxygen/overviews/windowsizing.h @@ -8,93 +8,87 @@ /** -@page overview_windowsizing Window Sizes +@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. -@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: +Glossary: --# 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. +@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 needs to override if it wants to calculate + its own best size based on its content. -@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. +@li @b "Min 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 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 minimal 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. +@li @b "Size": the size of a widget 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. -@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. +@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. 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 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 "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. -@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. +Functions related to sizing: -@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. +@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. -@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(). +@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. -@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. +@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. -@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. +@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. */ diff --git a/interface/window.h b/interface/window.h index 93cc5d7e52..a954e1c579 100644 --- a/interface/window.h +++ b/interface/window.h @@ -445,6 +445,20 @@ public: Gets the size which best suits the window: for a control, it would be the minimal size which doesn't truncate the control, for a panel - the same size as it would have after a call to Fit(). + + The default implementation of this function 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 those are 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 minimal size will be + used as its best size. + -# Otherwise if there is no minimal size set, then the current size is used + for the best size. + + @see @ref overview_windowsizing */ virtual wxSize DoGetBestSize() const; @@ -544,13 +558,22 @@ public: wxWindow* parent = NULL); /** - Sizes the window so that it fits around its subwindows. This function won't do - anything if there are no subwindows and will only really work correctly if - sizers are used for the subwindows layout. Also, if the window has exactly one - subwindow it is better (faster and the result is more precise as Fit adds some - margin to account for fuzziness of its calculations) to call + Sizes the window so that it fits around its subwindows. - instead of calling Fit. + This function won't do anything if there are no subwindows and will only really + work correctly if sizers are used for the subwindows layout. + + Also, if the window has exactly one subwindow it is better (faster and the result + is more precise as Fit() adds some margin to account for fuzziness of its calculations) + to call: + + @begincode + window->SetClientSize(child->GetSize()); + @endcode + + instead of calling Fit(). + + @see @ref overview_windowsizing */ virtual void Fit(); @@ -596,8 +619,7 @@ public: wxAccessible* GetAccessible(); /** - This method is deprecated, use GetEffectiveMinSize() - instead. + This method is deprecated, use GetEffectiveMinSize() instead. */ wxSize GetAdjustedBestSize() const; @@ -771,11 +793,11 @@ public: wxDropTarget* GetDropTarget() const; /** - Merges the window's best size into the min size and returns the - result. This is the value used by sizers to determine the appropriate + Merges the window's best size into the min size and returns the result. + This is the value used by sizers to determine the appropriate ammount of space to allocate for the widget. - @see GetBestSize(), SetInitialSize() + @see GetBestSize(), SetInitialSize(), @ref overview_windowsizing */ wxSize GetEffectiveMinSize() const; @@ -1375,9 +1397,11 @@ public: /** Invokes the constraint-based layout algorithm or the sizer-based algorithm for this window. - See SetAutoLayout(): when auto - layout is on, this function gets called automatically when the window is - resized. + + See SetAutoLayout(): when auto layout is on, this function gets called automatically + when the window is resized. + + @see @ref overview_windowsizing */ void Layout(); @@ -2055,15 +2079,18 @@ public: /** A @e smart SetSize that will fill in default size components with the - window's @e best size values. Also sets the window's minsize to - the value passed in for use with sizers. This means that if a full or - partial size is passed to this function then the sizers will use that - size instead of the results of GetBestSize to determine the minimum - needs of the window for layout. + window's @e best size values. + + Also sets the window's minsize to the value passed in for use with sizers. + This means that if a full or partial size is passed to this function then + the sizers will use that size instead of the results of GetBestSize() to + determine the minimum needs of the window for layout. + Most controls will use this to set their initial size, and their min size to the passed in value (if any.) - @see SetSize(), GetBestSize(), GetEffectiveMinSize() + @see SetSize(), GetBestSize(), GetEffectiveMinSize(), + @ref overview_windowsizing */ void SetInitialSize(const wxSize& size = wxDefaultSize);