9e0ed08360
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@60462 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
135 lines
4.4 KiB
C++
135 lines
4.4 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: wx/kbdstate.h
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// Purpose: documentation of wxKeyboardState
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// Author: wxWidgets team
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// Created: 2008-09-19
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// RCS-ID: $Id$
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// Licence: wxWindows license
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/////////////////////////////////////////////////////////////////////////////
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/**
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Provides methods for testing the state of the keyboard modifier keys.
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This class is used as a base class of wxKeyEvent and wxMouseState and,
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hence, indirectly, of wxMouseEvent, so its methods may be used to get
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information about the modifier keys which were pressed when the event
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occurred.
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This class is implemented entirely inline in @<wx/kbdstate.h@> and thus has
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no linking requirements.
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@nolibrary
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@category{events}
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@see wxKeyEvent, wxMouseState
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*/
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class wxKeyboardState
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{
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public:
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/**
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Constructor initializes the modifier key settings.
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By default, no modifiers are active.
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*/
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wxKeyboardState(bool controlDown = false,
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bool shiftDown = false,
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bool altDown = false,
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bool metaDown = false);
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/**
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Return the bit mask of all pressed modifier keys.
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The return value is a combination of @c wxMOD_ALT, @c wxMOD_CONTROL,
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@c wxMOD_SHIFT and @c wxMOD_META bit masks. Additionally, @c wxMOD_NONE
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is defined as 0, i.e. corresponds to no modifiers (see HasModifiers())
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and @c wxMOD_CMD is either @c wxMOD_CONTROL (MSW and Unix) or
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@c wxMOD_META (Mac), see CmdDown().
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See ::wxKeyModifier for the full list of modifiers.
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Notice that this function is easier to use correctly than, for example,
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ControlDown() because when using the latter you also have to remember to
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test that none of the other modifiers is pressed:
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@code
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if ( ControlDown() && !AltDown() && !ShiftDown() && !MetaDown() )
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... handle Ctrl-XXX ...
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@endcode
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and forgetting to do it can result in serious program bugs (e.g. program
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not working with European keyboard layout where @c AltGr key which is
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seen by the program as combination of CTRL and ALT is used). On the
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other hand, you can simply write:
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@code
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if ( GetModifiers() == wxMOD_CONTROL )
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... handle Ctrl-XXX ...
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@endcode
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with this function.
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*/
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int GetModifiers() const;
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/**
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Returns true if any modifiers at all are pressed.
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This is equivalent to @c GetModifiers() @c != @c wxMOD_NONE.
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*/
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bool HasModifiers() const;
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/**
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Returns true if the Control key is pressed.
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This function doesn't distinguish between right and left control keys.
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In portable code you usually want to use CmdDown() to automatically
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test for the more frequently used Command key (and not the rarely used
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Control one) under Mac.
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Notice that GetModifiers() should usually be used instead of this one.
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*/
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bool ControlDown() const;
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/**
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Returns true if the Shift key is pressed.
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This function doesn't distinguish between right and left shift keys.
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Notice that GetModifiers() should usually be used instead of this one.
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*/
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bool ShiftDown() const;
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/**
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Returns true if the Meta/Windows/Apple key is pressed.
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This function tests the state of the key traditionally called Meta
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under Unix systems, Windows keys under MSW and Apple, or Command, key
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under Mac.
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Notice that GetModifiers() should usually be used instead of this one.
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@see CmdDown()
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*/
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bool MetaDown() const;
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/**
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Returns true if the Alt key is pressed.
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Notice that GetModifiers() should usually be used instead of this one.
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*/
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bool AltDown() const;
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/**
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Returns true if the key used for command accelerators is pressed.
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@c Cmd is a pseudo key which is Control for PC and Unix platforms but
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Apple (or Command) key under Macs: it makes often sense to use it
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instead of ControlDown() because @c Command key is used for the same
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thing under Mac as @c Control elsewhere (even though @c Control still
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exists, it is usually not used for the same purpose under Mac).
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Notice that GetModifiers() should usually be used instead of this one.
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*/
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bool CmdDown() const;
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};
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