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| author | rsc <devnull@localhost> | 2005-01-14 03:45:44 +0000 |
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| committer | rsc <devnull@localhost> | 2005-01-14 03:45:44 +0000 |
| commit | 78e51a8c6678b6e3dff3d619aa786669f531f4bc (patch) | |
| tree | 015e00fde4fc837fd31b705e18d17dc913829388 /man/man3/window.html | |
| parent | 2634795b5f0053bc0ff08e5d7bbc0eda8efea061 (diff) | |
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diff --git a/man/man3/window.html b/man/man3/window.html new file mode 100644 index 00000000..83355bdd --- /dev/null +++ b/man/man3/window.html @@ -0,0 +1,241 @@ +<head> +<title>window(3) - Plan 9 from User Space</title> +<meta content="text/html; charset=utf-8" http-equiv=Content-Type> +</head> +<body bgcolor=#ffffff> +<table border=0 cellpadding=0 cellspacing=0 width=100%> +<tr height=10><td> +<tr><td width=20><td> +<tr><td width=20><td><b>WINDOW(3)</b><td align=right><b>WINDOW(3)</b> +<tr><td width=20><td colspan=2> + <br> +<p><font size=+1><b>NAME </b></font><br> + +<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + Screen, allocscreen, publicscreen, freescreen, allocwindow, bottomwindow, + bottomnwindows, topwindow, topnwindows, originwindow – window management<br> + +</table> +<p><font size=+1><b>SYNOPSIS </b></font><br> + +<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + <tt><font size=+1>#include <u.h><br> + #include <libc.h><br> + #include <draw.h><br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + </font></tt> + <tt><font size=+1>typedef<br> + struct Screen<br> + {<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + Display *display; /* display holding data */<br> + int id; /* id of system−held Screen */<br> + Image *image; /* unused; for reference only */<br> + Image *fill; /* color to paint behind windows */<br> + + </table> + } Screen;<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + Screen* allocscreen(Image *image, Image *fill, int public) + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + </font></tt> + <tt><font size=+1>Screen* publicscreen(Display *d, int id, ulong chan) + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + </font></tt> + <tt><font size=+1>int freescreen(Screen *s) + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + </font></tt> + <tt><font size=+1>Image* allocwindow(Screen *s, Rectangle r, int ref, int val) + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + </font></tt> + <tt><font size=+1>void bottomwindow(Image *w) + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + </font></tt> + <tt><font size=+1>void bottomnwindows(Image **wp, int nw) + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + </font></tt> + <tt><font size=+1>void topwindow(Image *w) + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + </font></tt> + <tt><font size=+1>void topnwindows(Image **wp, int nw) + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + </font></tt> + <tt><font size=+1>int originwindow(Image *w, Point log, Point scr) + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + </font></tt> + <tt><font size=+1>enum<br> + {<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + /* refresh methods */<br> + Refbackup= 0,<br> + Refnone= 1,<br> + Refmesg= 2<br> + + </table> + + </table> + };<br> + </font></tt> +</table> +<p><font size=+1><b>DESCRIPTION </b></font><br> + +<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + Windows are represented as <tt><font size=+1>Images</font></tt> and may be treated as regular + images for all drawing operations. The routines discussed here + permit the creation, deletion, and shuffling of windows, facilities + that do not apply to regular images. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + To create windows, it is first necessary to allocate a <tt><font size=+1>Screen</font></tt> + data structure to gather them together. A <tt><font size=+1>Screen</font></tt> turns an arbitrary + image into something that may have windows upon it. It is created + by <tt><font size=+1>allocscreen</font></tt>, which takes an <i>image</i> upon which to place the windows + (typically <tt><font size=+1>display−>image</font></tt>), a <i>fill</i> image + to paint the background behind all the windows on the image, and + a flag specifying whether the result should be publicly visible. + If it is public, an arbitrary other program connected to the same + display may acquire a pointer to the same screen by calling <tt><font size=+1>publicscreen</font></tt> + with the <tt><font size=+1>Display</font></tt> pointer and the <i>id</i> of the + published <tt><font size=+1>Screen</font></tt>, as well as the expected channel descriptor, + as a safety check. It will usually require some out-of-band coordination + for programs to share a screen profitably. <tt><font size=+1>Freescreen</font></tt> releases + a <tt><font size=+1>Screen</font></tt>, although it may not actually disappear from view until + all the windows upon it have also been + deallocated. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + Unlike <tt><font size=+1>allocwindow</font></tt>, <tt><font size=+1>allocscreen</font></tt> does <i>not</i> initialize the appearance + of the <tt><font size=+1>Screen</font></tt>. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + Windows are created by <tt><font size=+1>allocwindow</font></tt>, which takes a pointer to the + <tt><font size=+1>Screen</font></tt> upon which to create the window, a rectangle <i>r</i> defining + its geometry, an integer pixel value <i>val</i> to color the window initially, + and a refresh method <tt><font size=+1>ref</font></tt>. The refresh methods are <tt><font size=+1>Refbackup</font></tt>, which + provides backing store and is the + method used by <a href="../man1/rio.html"><i>rio</i>(1)</a> for its clients; <tt><font size=+1>Refnone</font></tt>, which provides + no refresh and is designed for temporary uses such as sweeping + a display rectangle, for windows that are completely covered by + other windows, and for windows that are already protected by backing + store; and <tt><font size=+1>Refmesg</font></tt>, which causes messages to be + delivered to the owner of the window when it needs to be repainted. + <tt><font size=+1>Refmesg</font></tt> is not fully implemented. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + The result of <tt><font size=+1>allocwindow</font></tt> is an <tt><font size=+1>Image</font></tt> pointer that may be treated + like any other image. In particular, it is freed by calling <tt><font size=+1>freeimage</font></tt> + (see <a href="../man3/allocimage.html"><i>allocimage</i>(3)</a>). The following functions, however, apply only + to windows, not regular images. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + <tt><font size=+1>Bottomwindow</font></tt> pushes window <i>w</i> to the bottom of the stack of windows + on its <tt><font size=+1>Screen</font></tt>, perhaps obscuring it. <tt><font size=+1>Topwindow</font></tt> pulls window <i>w</i> + to the top, making it fully visible on its <tt><font size=+1>Screen</font></tt>. (This <tt><font size=+1>Screen</font></tt> + may itself be within a window that is not fully visible; <tt><font size=+1>topwindow</font></tt> + will not affect the stacking of this parent + window.) <tt><font size=+1>Bottomnwindows</font></tt> and <tt><font size=+1>Topnwindows</font></tt> are analogous, but push + or pull a group of <i>nw</i> windows listed in the array <i>wp</i>. The order + within <i>wp</i> is unaffected. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + Each window is created as an <tt><font size=+1>Image</font></tt> whose <tt><font size=+1>Rectangle r</font></tt> corresponds + to the rectangle given to <tt><font size=+1>allocwindow</font></tt> when it was created. Thus, + a newly created window <i>w</i> resides on its <tt><font size=+1>Screen−>image</font></tt> at <i>w</i><tt><font size=+1>−>r</font></tt> and + has internal coordinates <i>w</i><tt><font size=+1>−>r</font></tt><i>.</i> Both these may be changed by a call + to <tt><font size=+1>originwindow</font></tt>. The two + <tt><font size=+1>Point</font></tt> arguments to <tt><font size=+1>originwindow</font></tt> define the upper left corner of + the logical coordinate system (<i>log</i>) and screen position (<i>scr</i>). + Their usage is shown in the Examples section. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + <a href="../man1/Rio.html"><i>Rio</i>(1)</a> creates its client windows with backing store, <tt><font size=+1>Refbackup</font></tt>. + The graphics initialization routine, <tt><font size=+1>initdraw</font></tt> (see <a href="../man3/graphics.html"><i>graphics</i>(3)</a>), + builds a <tt><font size=+1>Screen</font></tt> upon this, and then allocates upon that another + window indented to protect the border. That window is created + <tt><font size=+1>Refnone</font></tt>, since the backing store created by <tt><font size=+1>rio + </font></tt>protects its contents. That window is the one known in the library + by the global name <tt><font size=+1>screen</font></tt> (a historic but confusing choice).<br> + +</table> +<p><font size=+1><b>EXAMPLES </b></font><br> + +<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + To move a window to the upper left corner of the display,<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + <tt><font size=+1>originwindow(w, w−>r.min, Pt(0, 0));<br> + </font></tt> + </table> + + </table> + To leave a window where it is on the screen but change its internal + coordinate system so (0, 0) is the upper left corner of the window,<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + <tt><font size=+1>originwindow(w, Pt(0, 0), w−>r.min);<br> + </font></tt> + </table> + + </table> + After this is done, <tt><font size=+1>w−>r</font></tt> is translated to the origin and there + will be no way to discover the actual screen position of the window + unless it is recorded separately.<br> + +</table> +<p><font size=+1><b>SOURCE </b></font><br> + +<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + <tt><font size=+1>/usr/local/plan9/src/libdraw<br> + </font></tt> +</table> +<p><font size=+1><b>SEE ALSO </b></font><br> + +<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + <a href="../man3/graphics.html"><i>graphics</i>(3)</a>, <a href="../man3/draw.html"><i>draw</i>(3)</a>, <a href="../man3/cachechars.html"><i>cachechars</i>(3)</a>, <a href="../man3/draw.html"><i>draw</i>(3)</a><br> + +</table> +<p><font size=+1><b>BUGS </b></font><br> + +<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + The refresh method <tt><font size=+1>Refmesg</font></tt> should be finished.<br> + +</table> + +<td width=20> +<tr height=20><td> +</table> +<!-- TRAILER --> +<table border=0 cellpadding=0 cellspacing=0 width=100%> +<tr height=15><td width=10><td><td width=10> +<tr><td><td> +<center> +<a href="../../"><img src="../../dist/spaceglenda100.png" alt="Space Glenda" border=1></a> +</center> +</table> +<!-- TRAILER --> +</body></html> |