contiki/core/ctk/ctk-draw.h

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/**
* \addtogroup ctk
* @{
*/
/**
* \file
* CTK screen drawing module interface, ctk-draw.
* \author Adam Dunkels <adam@dunkels.com>
*
* This file contains the interface for the ctk-draw module.The
* ctk-draw module takes care of the actual screen drawing for CTK by
* implementing a handful of functions that are called by CTK.
*
*/
/*
* Copyright (c) 2002-2003, Adam Dunkels.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This file is part of the Contiki desktop OS.
*
*
*/
#ifndef CTK_DRAW_H_
#define CTK_DRAW_H_
#include "ctk/ctk.h"
#include "contiki-conf.h"
/**
* \defgroup ctkdraw CTK device driver functions
* @{
*
* The CTK device driver functions are divided into two modules, the
* ctk-draw module and the ctk-arch module. The purpose of the
* ctk-arch and the ctk-draw modules is to act as an interface between
* the CTK and the actual hardware of the system on which Contiki is
* run. The ctk-arch takes care of the keyboard input from the user,
* and the ctk-draw is responsible for drawing the CTK desktop,
* windows and user interface widgets onto the actual screen.
*
* More information about the ctk-draw and the ctk-arch modules can be
* found in the sections \ref ctk-draw and \ref ctk-arch.
*/
/**
* \page ctk-draw The ctk-draw module
*
* In order to work efficiently even on limited systems, CTK uses a
* simple coordinate system, where the screen is addressed using
* character coordinates instead of pixel coordinates. This makes it
* trivial to implement the coordinate system on a text-based screen,
* and significantly reduces complexity for pixel based screen
* systems.
*
* The top left of the screen is (0,0) with x and y coordinates
* growing downwards and to the right.
*
* It is the responsibility of the ctk-draw module to keep track of
* the screen size and must implement the two functions
* ctk_draw_width() and ctk_draw_height(), which are used by the CTK
* for querying the screen size. The functions must return the width
* and the height of the ctk-draw screen in character coordinates.
*
* The ctk-draw module is responsible for drawing CTK windows onto the
* screen through the function ctk_draw_window().. A pseudo-code
* implementation of this function might look like this:
* \code
ctk_draw_window(window, focus, clipy1, clipy2, draw_borders) {
if(draw_borders) {
draw_window_borders(window, focus, clipy1, clipy2);
}
foreach(widget, window->inactive) {
ctk_draw_widget(widget, focus, clipy1, clipy2);
}
foreach(widget, window->active) {
if(widget == window->focused) {
ctk_draw_widget(widget, focus | CTK_FOCUS_WIDGET,
clipy1, clipy2);
} else {
ctk_draw_widget(widget, focus, clipy1, clipy2);
}
}
}
\endcode
*
* Where draw_window_borders() draws the window borders (also between
* clipy1 and clipy2). The ctk_draw_widget() function is explained
* below. Notice how the clipy1 and clipy2 parameters are passed to
* all other functions; every function needs to know the boundaries
* within which they are allowed to draw.
*
* In order to aid in implementing a ctk-draw module, a text-based
* ctk-draw called ctk-conio has already been implemented. It conforms
* to the Borland conio C library, and a skeleton implementation of
* said library exists in lib/libconio.c. If a more machine specific
* ctk-draw module is to be implemented, the instructions in this file
* should be followed.
*
*/
/**
* The initialization function.
*
* This function is supposed to get the screen ready for drawing, and
* may be called at more than one time during the operation of the
* system.
*/
void ctk_draw_init(void);
/**
* Clear the screen between the clip bounds.
*
* This function should clear the screen between the y coordinates
* "clipy1" and "clipy2", including the line at y coordinate "clipy1",
* but not the line at y coordinate "clipy2".
*
* \note This function may be used to draw a background image
* (wallpaper) on the desktop; it does not necessarily "clear" the
* screen.
*
* \param clipy1 The lower y coordinate of the clip region.
* \param clipy2 The upper y coordinate of the clip region.
*/
void ctk_draw_clear(unsigned char clipy1, unsigned char clipy2);
/**
* Draw the window background.
*
* This function will be called by the CTK before a window will be
* completely redrawn.The function is supposed to draw the window
* background, excluding window borders as these should be drawn by
* the function that actually draws the window, between "clipy1" and
* "clipy2".
*
* \note This function does not necessarily have to clear the window -
* it can be used for drawing a background pattern in the window as
* well.
*
* \param window The window for which the background should be drawn.
*
* \param focus The focus of the window, either CTK_FOCUS_NONE for a
* background window, or CTK_FOCUS_WINDOW for the foreground window.
*
* \param clipy1 The lower y coordinate of the clip region.
* \param clipy2 The upper y coordinate of the clip region.
*/
void ctk_draw_clear_window(struct ctk_window *window,
unsigned char focus,
unsigned char clipy1,
unsigned char clipy2);
/**
* Draw a window onto the screen.
*
* This function is called by the CTK when a window should be drawn on
* the screen. The ctk-draw layer is free to choose how the window
* will appear on screen; with or without window borders and the style
* of the borders, with or without transparent window background and
* how the background shall look, etc.
*
* \param window The window which is to be drawn.
*
* \param focus Specifies if the window should be drawn in foreground
* or background colors and can be either CTK_FOCUS_NONE or
* CTK_FOCUS_WINDOW. Windows with a focus of CTK_FOCUS_WINDOW is
* usually drawn in a brighter color than those with CTK_FOCUS_NONE.
*
* \param clipy1 Specifies the first lines on screen that actually
* should be drawn, in screen coordinates (line 1 is the first line
* below the menus).
*
* \param clipy2 Specifies the last + 1 line on screen that should be
* drawn, in screen coordinates (line 1 is the first line below the
* menus)
*
*/
void ctk_draw_window(struct ctk_window *window,
unsigned char focus,
unsigned char clipy1,
unsigned char clipy2,
unsigned char draw_borders);
/**
* Draw a dialog onto the screen.
*
* In CTK, a dialog is similar to a window, with the only exception
* being that they are drawn in a different style. Also, since dialogs
* always are drawn on top of everything else, they do not need to be
* drawn within any special boundaries.
*
* \note This function can usually be implemented so that it uses the
* same widget drawing code as the ctk_draw_window() function.
*
* \param dialog The dialog that is to be drawn.
*/
void ctk_draw_dialog(struct ctk_window *dialog);
/**
* Draw a widget on a window.
*
* This function is used for drawing a CTK widgets onto the screem is
* likely to be the most complex function in the ctk-draw
* module. Still, it is straightforward to implement as it can be
* written in an incremental fashion, starting with a single widget
* type and adding more widget types, one at a time.
* The ctk-draw module may exploit how the CTK focus constants are
* defined in order to use a look-up table for the colors. The CTK
* focus constants are defined in the file ctk/ctk.h as follows:
\code
#define CTK_FOCUS_NONE 0
#define CTK_FOCUS_WIDGET 1
#define CTK_FOCUS_WINDOW 2
#define CTK_FOCUS_DIALOG 4
\endcode
* This gives the following table:
\code
0: CTK_FOCUS_NONE (Background window, non-focused widget)
1: CTK_FOCUS_WIDGET (Background window, focused widget)
2: CTK_FOCUS_WINDOW (Foreground window, non-focused widget)
3: CTK_FOCUS_WINDOW | CTK_FOCUS_WIDGET
(Foreground window, focused widget)
4: CTK_FOCUS_DIALOG (Dialog, non-focused widget)
5: CTK_FOCUS_DIALOG | CTK_FOCUS_WIDGET
(Dialog, focused widget)
\endcode
* \param w The widget to be drawn.
* \param focus The focus of the widget.
* \param clipy1 The lower y coordinate of the clip region.
* \param clipy2 The upper y coordinate of the clip region.
*/
void ctk_draw_widget(struct ctk_widget *w,
unsigned char focus,
unsigned char clipy1,
unsigned char clipy2);
void ctk_draw_menus(struct ctk_menus *menus);
/* Returns width and height of screen. */
CCIF unsigned char ctk_draw_width(void);
CCIF unsigned char ctk_draw_height(void);
extern unsigned char ctk_draw_windowborder_width,
ctk_draw_windowborder_height,
ctk_draw_windowtitle_height;
#endif /* CTK_DRAW_H_ */
/**
* The keyboard character type of the system
*
* The ctk_arch_key_t is usually typedef'd to the char type, but some
* systems (such as VNC) have a 16-bit key type.
*
* \var typedef char ctk_arch_key_t;
*/
/**
* Get a keypress from the keyboard input queue.
*
* This function will remove the first keypress in the keyboard input
* queue and return it. If the keyboard queue is empty, the return
* value is undefined. This function is intended to be used only after
* the ctk_arch_keyavail() function has returned non-zero.
*
* \return The first keypress from the keyboard input queue.
*
* \fn ctk_arch_key_t ctk_arch_getkey(void);
*/
/**
* Check if there is a keypress in the keyboard input queue.
*
* \return Zero if the keyboard input queue is empty, non-zero
* otherwise.
*
* \fn unsigned char ctk_arch_keyavail(void);
*/
/**
* The character used for the Return/Enter key.
*
* \define #define CH_ENTER '\n'
*/
/**
* \page ctk-arch The ctk-arch module
*
* The ctk-arch module deals with keyboard input from the underlying
* target system on which Contiki is running. The ctk-arch manages a
* keyboard input queue that is queried using the two functions
* ctk_arch_keyavail() and ctk_arch_getkey().
*/
/** @} */
/** @} */