mirror of
https://github.com/netsurf-browser/netsurf
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260 lines
8.7 KiB
C
260 lines
8.7 KiB
C
/*
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* Copyright 2010 Vincent Sanders <vince@simtec.co.uk>
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*
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* This file is part of NetSurf, http://www.netsurf-browser.org/
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*
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* NetSurf is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* NetSurf is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef NETSURF_FB_FBTK_WIDGET_H
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#define NETSURF_FB_FBTK_WIDGET_H
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#include <stdbool.h>
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enum fbtk_widgettype_e {
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FB_WIDGET_TYPE_ROOT = 0,
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FB_WIDGET_TYPE_WINDOW,
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FB_WIDGET_TYPE_BITMAP,
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FB_WIDGET_TYPE_FILL,
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FB_WIDGET_TYPE_TEXT,
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FB_WIDGET_TYPE_HSCROLL,
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FB_WIDGET_TYPE_VSCROLL,
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FB_WIDGET_TYPE_USER,
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};
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/** Widget description.
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*
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* A widget is an entry in a tree structure which represents a
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* rectangular area with co-ordinates relative to its parent widget.
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* This area has a distinct set of callback operations for handling
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* events which occour within its boundries. A widget may have an
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* arbitrary number of child widgets. The order within the tree
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* determines a widgets z order.
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*
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* ---
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* A
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* |
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* +----------+
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* +--->| Button 3 |
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* | +----------+
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* | | A
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* | V |
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* | +----------+
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* | | Button 2 |
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* | +----------+
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* | | A
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* | V |
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* | +----------+
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* | | Button 1 |
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* | +----------+
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* | | A
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* | V |
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* --- | +----------+
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* A | +->| Filled |
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* | | | +----------+
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* +----------+ | | |
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* +---->| |-+ | V
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* | | Window 1 | | --- ---
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* | | |---+ A
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* | +----------+ |
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* | | A +----------+ ---
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* | | | +--->| Button 2 | A
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* | | | | +----------+ |
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* | | | | | A +-------------+
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* | | | | | | +--->| Button Up |
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* | | | | | | | +-------------+
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* | | | | | | | | A
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* | | | | | | | V |
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* | | | | | | | +-------------+
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* | | | | | | | | Button Down |
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* | | | | | | | +-------------+
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* | | | | | | | | A
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* | | | | | | | V |
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* | | | | | | | +-------------+
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* | | | | | | | +->| Scroller |
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* | | | | V | | | +-------------+
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* | | | | +----------+ | | |
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* | | | | | |-+ | V
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* | | | | | V Scroll | | ---
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* | | | | | |---+
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* | | | | +----------+
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* | | | | | A
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* | | | | V |
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* | | | | +----------+
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* | | | | +->| Button 1 |
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* | | | | | +----------+
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* | +----------+ | | |
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* | | |-+ | V
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* | | Window 2 | | ---
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* | | |---+
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* | +----------+
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* | | A
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* | V |
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* | +------------+
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* --- | | Background |
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* A | +->| Bitmap |
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* | | | +------------+
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* +------+ | | |
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* | |-+ | V
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* | Root | | ---
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* | |---+
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* +------+
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* |
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* V
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* ---
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*
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* Every widget is contained within this generic wrapper. The
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* integrated union provides for data specific to a widget type.
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*/
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struct fbtk_widget_s {
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struct fbtk_widget_s *next; /* next lower z ordered widget in tree */
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struct fbtk_widget_s *prev; /* next higher z ordered widget in tree */
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struct fbtk_widget_s *parent; /* parent widget */
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struct fbtk_widget_s *first_child; /* first child widget */
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struct fbtk_widget_s *last_child; /* last child widget */
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/* flags */
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bool mapped; /**< The widget is mapped/visible . */
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/* Generic properties */
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int x;
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int y;
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int width;
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int height;
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colour bg;
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colour fg;
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/* event callback handlers */
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fbtk_callback callback[FBTK_CBT_END];
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void *callback_context[FBTK_CBT_END];
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/* widget redraw */
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struct {
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bool child; /* A child of this widget requires redrawing */
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bool needed; /* the widget requires redrawing */
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int x;
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int y;
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int width;
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int height;
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} redraw;
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enum fbtk_widgettype_e type; /**< The type of the widget */
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union {
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/* toolkit base handle */
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struct {
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nsfb_t *fb;
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struct fbtk_widget_s *prev; /* previous widget pointer wasin */
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struct fbtk_widget_s *grabbed; /* widget that has grabbed pointer movement. */
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struct fbtk_widget_s *input;
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/* caret */
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struct {
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struct fbtk_widget_s *owner; /* widget / NULL */
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int x; /* relative to owner */
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int y; /* relative to owner */
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int height;
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void (*remove_cb)(fbtk_widget_t *widget);
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} caret;
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} root;
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/* bitmap */
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struct {
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struct fbtk_bitmap *bitmap;
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} bitmap;
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/* text */
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struct {
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char* text;
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bool outline;
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fbtk_enter_t enter;
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void *pw;
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int idx; /* caret pos in text */
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int len; /* text length */
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int width; /* text width in px */
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int idx_offset; /* caret pos in pixels */
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} text;
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/* application driven widget */
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struct {
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void *pw; /* private data for user widget */
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} user;
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struct {
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int minimum; /* lowest value of scrollbar */
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int maximum; /* highest value of scrollbar */
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int thumb; /* size of bar representing a page */
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int page; /* amount to page document */
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int position; /* position of bar */
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int drag; /* offset to start of drag */
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int drag_position; /* indicator bar pos at drag start */
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struct fbtk_widget_s *btnul; /* scroll button up/left */
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struct fbtk_widget_s *btndr; /* scroll button down/right*/
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} scroll;
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} u;
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};
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/* These functions are not considered part of the public API but are
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* not static as they are used by the higher level widget provision
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* routines
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*/
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/** creates a new widget and insert it into to hierachy.
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*
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* The widget is set to defaults of false, 0 or NULL.
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*
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* @param parent The parent widget. The new widget will be added with
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* the shallowest z order relative to its siblings.
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* @param type The type of the widget.
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* @param x The x co-ordinate relative to the parent widget.
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* @param y The y co-ordinate relative to the parent widget.
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* @param width the widgets width. This will be clipped to the parent, if
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* the value is 0 the largest extent which can fit within the parent
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* is used, if the value is negative the largest value that will fit
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* within the parent less the value given will be used.
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* @param height the widgets width. This will be clipped to the parent, if
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* the value is 0 the largest extent which can fit within the parent
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* is used, if the value is negative the largest value that will fit
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* within the parent less the value given will be used.
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*/
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fbtk_widget_t *fbtk_widget_new(fbtk_widget_t *parent, enum fbtk_widgettype_e type, int x, int y, int width, int height);
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/** find the root widget from any widget in the toolkit hierarchy.
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*
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* @param widget Any widget.
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* @return The root widget or NULL if \a widget was not valid.
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*/
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fbtk_widget_t *fbtk_get_root_widget(fbtk_widget_t *widget);
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/** set pointer to bitmap in context.
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*
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* widget helper callback to set cursor image to the bitmap passed in
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* the callbacks private data.
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*/
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int fbtk_set_ptr(fbtk_widget_t *widget, fbtk_callback_info *cbi);
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#endif
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/*
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* Local Variables:
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* c-basic-offset:8
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* End:
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*/
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