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<HTML><HEAD><TITLE>Xlib Programming Manual: Setting and Reading the WM_NORMAL_HINTS Property</TITLE></HEAD><BODY><H1 ALIGN=center>14.1.7 Setting and Reading the WM_NORMAL_HINTS Property</H1>Xlib provides functions that you can use to set or read the <A HREF="/gui/x/icccm/sec-4.html#WM_NORMAL_HINTS">WM_NORMAL_HINTS</A> property for a given window.The functions use the flags and the<B>XSizeHints</B>structure, as defined in the<B><TT>X11/Xutil.h</TT></B>header file.<P>The size of the<B>XSizeHints</B>structure may grow in future releases, as new components areadded to support new <A HREF="/gui/x/icccm/">ICCCM</A> features.Passing statically allocated instances of this structure intoXlib may result in memory corruption when running against afuture release of the library.As such, it is recommended that only dynamically allocatedinstances of the structure be used.<P>To allocate an<B>XSizeHints</B>structure, use<B><A HREF="XAllocSizeHints.html">XAllocSizeHints()</A></B>.<A NAME="XSizeHints"></A><P>The<B>XSizeHints</B>structure contains:<P><PRE><CODE>/* Size hints mask bits */#define <B>USPosition</B> (1L << 0) /* user specified x, y */#define <B>USSize</B> (1L << 1) /* user specified width, height */#define <B>PPosition</B> (1L << 2) /* program specified position */#define <B>PSize</B> (1L << 3) /* program specified size */#define <B>PMinSize</B> (1L << 4) /* program specified minimum size */#define <B>PMaxSize</B> (1L << 5) /* program specified maximum size */#define <B>PResizeInc</B> (1L << 6) /* program specified resize increments */#define <B>PAspect</B> (1L << 7) /* program specified min and max aspect ratios */#define <B>PBaseSize</B> (1L << 8)#define <B>PWinGravity</B> (1L << 9)#define <B>PAllHints</B> (PPosition|PSize|PMinSize|PMaxSize|PResizeInc|PAspect)</PRE></CODE><!.IN "XSizeHints" "" "@DEF@"><PRE><CODE>/* Values */typedef struct { long flags; /* marks which fields in this structure are defined */ int x, y; /* Obsolete */ int width, height; /* Obsolete */ int min_width, min_height; int max_width, max_height; int width_inc, height_inc; struct { int x; /* numerator */ int y; /* denominator */ } min_aspect, max_aspect; int base_width, base_height; int win_gravity; /* this structure may be extended in the future */} XSizeHints;</PRE></CODE><P>The <B>x</B>, <B>y</B>, <B>width</B>, and <B>height</B> members are now obsoleteand are left solely for compatibility reasons.The <B>min_width</B> and <B>min_height</B> members specify theminimum window size that still allows the application to be useful.The <B>max_width</B> and <B>max_height</B> members specify the maximum window size.The <B>width_inc</B> and <B>height_inc</B> members define an arithmetic progression ofsizes (minimum to maximum) into which the window prefers to be resized.The <B>min_aspect</B> and <B>max_aspect</B> members are expressedas ratios of <B>x</B> and <B>y</B>, and they allow an application to specify the range of aspectratios it prefers.The <B>base_width</B> and <B>base_height</B> members define the desired size of the window.The window manager will interpret the position of the window and its border width to position the point of the outer rectangle of the overall window specified by the <B>win_gravity</B> member.The outer rectangle of the window includes any borders or decorationssupplied by the window manager.In other words,if the window manager decides to place the window where the client asked,the position on the parent window's border named by the win_gravity will be placed where the client window would have been placed in the absence of a window manager.<P>Note that use of the<B>PAllHints</B>macro is highly discouraged.<P>To set a window's <A HREF="/gui/x/icccm/sec-4.html#WM_NORMAL_HINTS">WM_NORMAL_HINTS</A> property, use<B><A HREF="XSetWMNormalHints.html">XSetWMNormalHints()</A></B>.<P>To read a window's <A HREF="/gui/x/icccm/sec-4.html#WM_NORMAL_HINTS">WM_NORMAL_HINTS</A> property, use<B><A HREF="XGetWMNormalHints.html">XGetWMNormalHints()</A></B>.<P>To set a window's <A HREF="/gui/x/icccm/sec-4.html#WM_NORMAL_HINTS">WM_SIZE_HINTS</A> property, use<B><A HREF="XSetWMSizeHints.html">XSetWMSizeHints()</A></B>.<P>To read a window's <A HREF="/gui/x/icccm/sec-4.html#WM_NORMAL_HINTS">WM_SIZE_HINTS</A> property, use<B><A HREF="XGetWMSizeHints.html">XGetWMSizeHints()</A></B>.<H5 ALIGN=right><I>Next: <A HREF="wm-class.html">Setting and Reading the WM_CLASS Property</A></I></H5><HR><ADDRESS><A HREF="http://tronche.com/">Christophe Tronche</A>, <A HREF="mailto:ch.tronche@computer.org">ch.tronche@computer.org</A></ADDRESS></BODY></HTML>⌨️ 快捷键说明
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