src/programs/view/x11.h

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  37
  38 #ifndef _x11_h
  39 #define _x11_h
  40
  41 #include <stdio.h>
  42
  43 #include "Xstuff.h"
  44
  45 /* These colours will be mapped to black on a monochrome screen */
  46 extern unsigned long BLACK, BLUE, GREEN, CYAN, RED, BROWN, GREY, DARKGREY;
  47
  48 /* These colours will be mapped to white on a monochrome screen */
  49 extern unsigned long LIGHTBLUE, LIGHTGREY, LIGHTGREEN, LIGHTCYAN,
  50                      LIGHTRED, VIOLET, YELLOW, WHITE;
  51
  52 #define CBARGS (struct t_x11 *x11, XEvent *event, Window w, void *data)
  53 /* Callback function. Return false to continue, true to exit */
  54
  55 typedef struct t_x11 {
  56     Display            *disp;
  57     XFontStruct        *font;
  58     GC                  gc;
  59     Window              root;
  60     char               *dispname;
  61     FILE               *console;
  62     int                 screen, depth;
  63     Colormap            cmap;
  64     unsigned long       fg, bg;
  65     char               *title;
  66     struct t_wlist     *wlist;
  67     void        (*GetNamedColor)(struct t_x11 *x11, const char *name, unsigned long *col);
  68     void        (*MainLoop)(struct t_x11 *x11);
  69     void        (*RegisterCallback)(struct t_x11 *x11, Window w, Window Parent,
  70                                     bool cb CBARGS, void *data);
  71     void        (*UnRegisterCallback)(struct t_x11 *x11, Window w);
  72     void        (*SetInputMask)(struct t_x11 *x11, Window w, unsigned long mask);
  73     unsigned long       (*GetInputMask)(struct t_x11 *x11, Window w);
  74     void        (*CleanUp)(struct t_x11 *x11);
  75     void        (*Flush)(struct t_x11 *x11);
  76 } t_x11;
  77
  78 typedef bool CallBack CBARGS;
  79
  80 typedef struct t_wlist {
  81     Window                 w;      /* The window itself                 */
  82     Window                 Parent; /* It's parent window                        */
  83     CallBack              *cb;     /* Call back function                        */
  84     unsigned long          mask;   /* Input mask                                */
  85     void                  *data;   /* User data struct                  */
  86     struct t_wlist        *next;
  87 } t_wlist;
  88
  89 t_x11 *GetX11(int *argc, char *argv[]);
  90 /* x11 is a struct / function-set that manages a number of windows.
  91  * more or (presumably) less like Xt does, but since x11 uses only
  92  * Xlib calls, it is *PORTABLE* software.
  93  *
  94  * The x11 struct is in principle Object Oriented, in that the functions
  95  * are member of the struct. This makes the software a little more
  96  * managable. Because of portability I decided not to use C++, even
  97  * though it would be much nicer to work with in the X-Bizz.
  98  *
  99  * Here's the description of how to use the x11 struct
 100  * 1. Call the GetX11 routine, with the argc and argv from your main.
 101  *    This will sort out the X-arguments on the command line and remove
 102  *    them from the command line. When the routine returns, only the
 103  *    application specific arguments should be left. Thi opens the
 104  *    display, selects a font, creates a Graphics Context and also sets
 105  *    the colours listed above in the global variables.
 106  * 2. Call x11->RegisterCallback for each window you want to have
 107  *    managed by x11. You have to create a Callback routine for your
 108  *    application that handles *ONE* event at a time. The idea is that
 109  *    each window has it's own Callback which is not polluted by code
 110  *    for other windows, but it is of course entirely possible to have
 111  *    one Callback routine for a number of windows (eg. when you need
 112  *    to know something about your children).
 113  * 3. Call x11->SetInputMask. This comes in place of the normal
 114  *    XSelectInput, because it enables x11 to manually decide which
 115  *    events are passed to the windows. With the x11->GetInputMask,
 116  *    x11->SetInputMask combination, a child window can temporarily
 117  *    disable mouse and keyboard input for it's parent, while allowing
 118  *    redraw events to pass through for instance. Hereby a simple way
 119  *    for creating application modal child windows is implemented.
 120  * 4. Call x11->MainLoop. This will call every callback function as
 121  *    appropriate. When a window receives a message, that makes it decide
 122  *    to terminate it should call x11->UnRegisterCallback, in order to
 123  *    tell the x11 Manager that it does not want to receive any more
 124  *    events. It is up to the window to destroy itself. The MainLoop
 125  *    routine exits when there are no more windows to manage, i.e. when
 126  *    all routines have called UnRegisterCallback, OR when one Callback
 127  *    routine returns non-zero (true).
 128  * 5. Call x11->CleanUp. This closes the display, and frees all
 129  *    memory allocated by x11 before.
 130  */
 131
 132 extern void GetNamedColor(t_x11 *x11, const char *name, unsigned long *col);
 133
 134 #endif  /* _x11_h */