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