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author | Michael Drake <tlsa@netsurf-browser.org> | 2011-05-09 22:49:17 +0000 |
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committer | Michael Drake <tlsa@netsurf-browser.org> | 2011-05-09 22:49:17 +0000 |
commit | ac447fc293d791bf3155903d7755768f7a2b48ee (patch) | |
tree | 8d09d0e6228e9fbc1a834769e4553e816c643bb4 /desktop/scrollbar.c | |
parent | 5c95b32756affc5ce3ef88f919da4e3f801d776e (diff) | |
download | netsurf-ac447fc293d791bf3155903d7755768f7a2b48ee.tar.gz netsurf-ac447fc293d791bf3155903d7755768f7a2b48ee.tar.bz2 |
s/scroll/scrollbar/ and improve scrollbar widget comments.
svn path=/trunk/netsurf/; revision=12363
Diffstat (limited to 'desktop/scrollbar.c')
-rw-r--r-- | desktop/scrollbar.c | 826 |
1 files changed, 826 insertions, 0 deletions
diff --git a/desktop/scrollbar.c b/desktop/scrollbar.c new file mode 100644 index 000000000..2dfe0c9ef --- /dev/null +++ b/desktop/scrollbar.c @@ -0,0 +1,826 @@ +/* + * Copyright 2004-2008 James Bursa <bursa@users.sourceforge.net> + * Copyright 2008 Michael Drake <tlsa@netsurf-browser.org> + * Copyright 2009 Paul Blokus <paul_pl@users.sourceforge.net> + * + * This file is part of NetSurf, http://www.netsurf-browser.org/ + * + * NetSurf is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * NetSurf is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +/** \file + * Scrollbar widget (implementation). + */ + +#include <stdbool.h> +#include <stdlib.h> + +#include "desktop/mouse.h" +#include "desktop/scrollbar.h" +#include "desktop/plotters.h" +#include "desktop/plot_style.h" +#include "utils/log.h" +#include "utils/messages.h" +#include "utils/utils.h" + + +struct scrollbar { + bool horizontal; /* Horizontal scrollbar if true, else vertical + */ + int length; /* Length of the scrollbar widget */ + + int scrolled_d; /* The dimension of the scrolled area */ + int scrolled_vis; /* The visible part of the scrolled area */ + + int area_scroll; /* Scroll value of the scrolled area */ + int bar_off; /* Offset of the scrollbar */ + int bar_len; /* Length of the scrollbar */ + + scrollbar_client_callback client_callback; /* Callback receiving + * scrollbar events */ + void *client_data; /* User data passed to the callback */ + + bool dragging; /* Flag indicating drag at progess */ + int drag_start_coord; /* Coordinate value at drag start */ + int drag_start_bar_off; /* Scrollbar offset at drag start */ + bool reverse; /* Flag indicating that the scrollbar moves + * in the opposite direction to the mouse + */ + + struct scrollbar *pair; /* Parpendicular scrollbar, or NULL */ + bool pair_drag; /* Flag indicating that the current drag affects + the perpendicular scrollbar too */ +}; + + +/** Overflow scrollbar colours + * + * Overflow scrollbar colours can be set by front end code to try to match + * scrollbar colours used on the desktop. + * + * If a front end doesn't set scrollbar colours, these defaults are used. + */ +colour scrollbar_widget_fg_colour = 0x00d9d9d9; /* light grey */ +colour scrollbar_widget_bg_colour = 0x006b6b6b; /* mid grey */ +colour scrollbar_widget_arrow_colour = 0x00444444; /* dark grey */ + + +/** + * Create a scrollbar. + * + * \param horizontal true for a horizontal scrollbar false for a + * vertical one + * \param length full length of the scrollbar widget + * \param scrolled_dimension full length of the scrolled area + * \param scrolled_visible length of the visible part of the scrolled area + * \param client_data data for the client callback + * \param client_callback client callback for scrollbar events + * \param scrollbar gets updated to point at the newly created + * scrollbar + * \return true if scrollbar has been created succesfully + * or false on memory exhaustion + */ + +bool scrollbar_create(bool horizontal, int length, + int scrolled_dimension, int scrolled_visible, + void *client_data, scrollbar_client_callback client_callback, + struct scrollbar **scrollbar_pt) +{ + struct scrollbar *scrollbar; + int well_length; + + scrollbar = malloc(sizeof(struct scrollbar)); + if (scrollbar == NULL) { + LOG(("malloc failed")); + warn_user("NoMemory", 0); + *scrollbar_pt = NULL; + return false; + } + + scrollbar->horizontal = horizontal; + scrollbar->length = length; + scrollbar->scrolled_d = scrolled_dimension; + scrollbar->scrolled_vis = scrolled_visible; + scrollbar->area_scroll = 0; + scrollbar->bar_off = 0; + scrollbar->reverse = false; + scrollbar->pair = NULL; + scrollbar->pair_drag = false; + + well_length = length - 2 * SCROLLBAR_WIDTH; + scrollbar->bar_len = (well_length * scrolled_visible) / + scrolled_dimension; + + scrollbar->client_callback = client_callback; + scrollbar->client_data = client_data; + + scrollbar->dragging = false; + + *scrollbar_pt = scrollbar; + + return true; +} + + +/** + * Destroy a scrollbar. + * + * \param scrollbar the scrollbar to be destroyed + */ + +void scrollbar_destroy(struct scrollbar *scrollbar) +{ + if (scrollbar->pair != NULL) + scrollbar->pair->pair = NULL; + free(scrollbar); +} + + +/** + * Draw an outline rectangle common to a several scrollbar elements. + * + * \param x0 left border of the outline + * \param y0 top border of the outline + * \param x1 right border of the outline + * \param y1 bottom border of the outline + * \param c base colour of the outline, the other colours are created by + * lightening or darkening this one + * \param inset true for inset outline, false for an outset one + * \return + */ + +static inline bool scrollbar_redraw_scrollbar_rectangle(int x0, int y0, + int x1, int y1, colour c, bool inset) +{ + static plot_style_t c0 = { + .stroke_type = PLOT_OP_TYPE_SOLID, + .stroke_width = 1, + }; + + static plot_style_t c1 = { + .stroke_type = PLOT_OP_TYPE_SOLID, + .stroke_width = 1, + }; + + static plot_style_t c2 = { + .stroke_type = PLOT_OP_TYPE_SOLID, + .stroke_width = 1, + }; + + if (inset) { + c0.stroke_colour = darken_colour(c); + c1.stroke_colour = lighten_colour(c); + } else { + c0.stroke_colour = lighten_colour(c); + c1.stroke_colour = darken_colour(c); + } + c2.stroke_colour = blend_colour(c0.stroke_colour, c1.stroke_colour); + + /* Plot the outline */ + if (!plot.line(x0, y0, x1, y0, &c0)) return false; + if (!plot.line(x1, y0, x1, y1 + 1, &c1)) return false; + if (!plot.line(x1, y0, x1, y0 + 1, &c2)) return false; + if (!plot.line(x1, y1, x0, y1, &c1)) return false; + if (!plot.line(x0, y1, x0, y0, &c0)) return false; + if (!plot.line(x0, y1, x0, y1 + 1, &c2)) return false; + + return true; +} + + +/** + * Redraw a part of the scrollbar. + * + * \param scrollbar the scrollbar to be redrawn + * \param x the X coordinate to draw the scrollbar at + * \param y the Y coordinate to draw the scrollbar at + * \param clip the clipping rectangle + * \param scale scale for the redraw + * \return true on succes false otherwise + */ + +bool scrollbar_redraw(struct scrollbar *scrollbar, int x, int y, + const struct rect *clip, float scale) +{ + int w = SCROLLBAR_WIDTH; + int well_length, bar_off, bar_c0, bar_c1; + int v[6]; /* array of triangle vertices */ + int x0, y0, x1, y1; + + plot_style_t pstyle_scrollbar_widget_bg_colour = { + .fill_type = PLOT_OP_TYPE_SOLID, + .fill_colour = scrollbar_widget_bg_colour, + }; + plot_style_t pstyle_scrollbar_widget_fg_colour = { + .fill_type = PLOT_OP_TYPE_SOLID, + .fill_colour = scrollbar_widget_fg_colour, + }; + plot_style_t pstyle_scrollbar_widget_arrow_colour = { + .fill_type = PLOT_OP_TYPE_SOLID, + .fill_colour = scrollbar_widget_arrow_colour, + }; + + well_length = scrollbar->length - 2 * SCROLLBAR_WIDTH; + x0 = x; + y0 = y; + x1 = x + (scrollbar->horizontal ? + scrollbar->length : SCROLLBAR_WIDTH) - 1; + y1 = y + (scrollbar->horizontal ? + SCROLLBAR_WIDTH : scrollbar->length) - 1; + bar_off = scrollbar->bar_off; + bar_c1 = (scrollbar->horizontal ? x0 : y0) + SCROLLBAR_WIDTH + + scrollbar->bar_off + scrollbar->bar_len - 1; + + if (scale != 1.0) { + w *= scale; + well_length *= scale; + x0 *= scale; + y0 *= scale; + x1 *= scale; + y1 *= scale; + bar_off *= scale; + bar_c1 *= scale; + } + + bar_c0 = (scrollbar->horizontal ? x0 : y0) + w + bar_off; + + if (x1 < clip->x0 || y1 < clip->y0 || clip->x1 < x0 || clip->y1 < y0) + /* scrollbar is outside the clipping rectangle, nothing to + * render */ + return true; + + + if (scrollbar->horizontal) { + /* scrollbar is horizontal */ + + /* scrollbar outline */ + if (!scrollbar_redraw_scrollbar_rectangle(x0, y0, x1, y1, + scrollbar_widget_bg_colour, true)) + return false; + /* left arrow icon border */ + if (!scrollbar_redraw_scrollbar_rectangle(x0 + 1, + y0 + 1, + x0 + w - 2, + y1 - 1, + scrollbar_widget_fg_colour, false)) + return false; + /* left arrow icon background */ + if (!plot.rectangle(x0 + 2, + y0 + 2, + x0 + w - 2, + y1 - 1, + &pstyle_scrollbar_widget_fg_colour)) + return false; + /* left arrow */ + v[0] = x0 + w / 4; + v[1] = y0 + w / 2; + v[2] = x0 + w * 3 / 4; + v[3] = y0 + w / 4; + v[4] = x0 + w * 3 / 4; + v[5] = y0 + w * 3 / 4; + if (!plot.polygon(v, 3, &pstyle_scrollbar_widget_arrow_colour)) + return false; + /* scrollbar well background */ + if (!plot.rectangle(x0 + w - 1, + y0 + 1, + x1 - w + 2, + y1, + &pstyle_scrollbar_widget_bg_colour)) + return false; + /* scrollbar position indicator bar */ + if (!scrollbar_redraw_scrollbar_rectangle(bar_c0, + y0 + 1, + bar_c1, + y1 - 1, + scrollbar_widget_fg_colour, false)) + return false; + if (!plot.rectangle(bar_c0 + 1, + y0 + 2, + bar_c1, + y1 - 1, + &pstyle_scrollbar_widget_fg_colour)) + return false; + /* right arrow icon border */ + if (!scrollbar_redraw_scrollbar_rectangle(x1 - w + 2, + y0 + 1, + x1 - 1, + y1 - 1, + scrollbar_widget_fg_colour, false)) + return false; + /* right arrow icon background */ + if (!plot.rectangle(x1 - w + 3, + y0 + 2, + x1 - 1, + y1 - 1, + &pstyle_scrollbar_widget_fg_colour)) + return false; + /* right arrow */ + v[0] = x1 - w / 4 + 1; + v[1] = y0 + w / 2; + v[2] = x1 - w * 3 / 4 + 1; + v[3] = y0 + w / 4; + v[4] = x1 - w * 3 / 4 + 1; + v[5] = y0 + w * 3 / 4; + if (!plot.polygon(v, 3, &pstyle_scrollbar_widget_arrow_colour)) + return false; + } else { + /* scrollbar is vertical */ + + /* outline */ + if (!scrollbar_redraw_scrollbar_rectangle(x0, y0, x1, y1, + scrollbar_widget_bg_colour, + true)) + return false; + /* top arrow background */ + if (!scrollbar_redraw_scrollbar_rectangle(x0 + 1, + y0 + 1, + x1 - 1, + y0 + w - 2, + scrollbar_widget_fg_colour, + false)) + return false; + if (!plot.rectangle(x0 + 2, + y0 + 2, + x1 - 1, + y0 + w - 2, + &pstyle_scrollbar_widget_fg_colour)) + return false; + /* up arrow */ + v[0] = x0 + w / 2; + v[1] = y0 + w / 4; + v[2] = x0 + w / 4; + v[3] = y0 + w * 3 / 4; + v[4] = x0 + w * 3 / 4; + v[5] = y0 + w * 3 / 4; + if (!plot.polygon(v, 3, &pstyle_scrollbar_widget_arrow_colour)) + return false; + /* scrollbar well background */ + if (!plot.rectangle(x0 + 1, + y0 + w - 1, + x1, + y1 - w + 2, + &pstyle_scrollbar_widget_bg_colour)) + return false; + /* scrollbar position indicator bar */ + if (!scrollbar_redraw_scrollbar_rectangle(x0 + 1, + bar_c0, + x1 - 1, + bar_c1, + scrollbar_widget_fg_colour, false)) + return false; + if (!plot.rectangle(x0 + 2, + bar_c0 + 1, + x1 - 1, + bar_c1, + &pstyle_scrollbar_widget_fg_colour)) + return false; + /* bottom arrow background */ + if (!scrollbar_redraw_scrollbar_rectangle(x0 + 1, + y1 - w + 2, + x1 - 1, + y1 - 1, + scrollbar_widget_fg_colour, false)) + return false; + if (!plot.rectangle(x0 + 2, + y1 - w + 3, + x1 - 1, + y1 - 1, + &pstyle_scrollbar_widget_fg_colour)) + return false; + /* down arrow */ + v[0] = x0 + w / 2; + v[1] = y1 - w / 4 + 1; + v[2] = x0 + w / 4; + v[3] = y1 - w * 3 / 4 + 1; + v[4] = x0 + w * 3 / 4; + v[5] = y1 - w * 3 / 4 + 1; + if (!plot.polygon(v, 3, &pstyle_scrollbar_widget_arrow_colour)) + return false; + } + + return true; +} + + +/** + * Set the value of the scrollbar. + * + * \param scrollbar the scrollbar to have the value set + * \param scroll_val the new value to be set + * \param bar_pos true if the value is for the scrollbar indication bar + * offset, false if it is for the scrolled area one + */ + +void scrollbar_set(struct scrollbar *scrollbar, int scroll_val, bool bar_pos) +{ + int well_length; + struct scrollbar_msg_data msg; + + if (scroll_val < 0) + scroll_val = 0; + + if (scrollbar->scrolled_d == scrollbar->scrolled_vis) + return; + + well_length = scrollbar->length - 2 * SCROLLBAR_WIDTH; + if (bar_pos) { + if (scroll_val > well_length - scrollbar->bar_len) + scrollbar->bar_off = well_length - scrollbar->bar_len; + else + scrollbar->bar_off = scroll_val; + + scrollbar->area_scroll = ((scrollbar->scrolled_d - + scrollbar->scrolled_vis) * + (scrollbar->bar_off)) / + (well_length - scrollbar->bar_len); + + } else { + if (scroll_val > scrollbar->scrolled_d - + scrollbar->scrolled_vis) + scrollbar->area_scroll = scrollbar->scrolled_d - + scrollbar->scrolled_vis; + else + scrollbar->area_scroll = scroll_val; + + scrollbar->bar_off = (well_length * scrollbar->area_scroll) / + scrollbar->scrolled_d; + } + + msg.scrollbar = scrollbar; + msg.msg = SCROLLBAR_MSG_MOVED; + msg.new_scroll = scrollbar->area_scroll; + scrollbar->client_callback(scrollbar->client_data, &msg); + + msg.msg = SCROLLBAR_MSG_REDRAW; + msg.x0 = scrollbar->horizontal ? SCROLLBAR_WIDTH - 1 : 0; + msg.y0 = scrollbar->horizontal ? 0 : SCROLLBAR_WIDTH - 1; + msg.x1 = (scrollbar->horizontal ? + scrollbar->length - SCROLLBAR_WIDTH + 1 : + SCROLLBAR_WIDTH); + msg.y1 = (scrollbar->horizontal ? + SCROLLBAR_WIDTH : + scrollbar->length - SCROLLBAR_WIDTH + 1); + + scrollbar->client_callback(scrollbar->client_data, &msg); +} + + +/** + * Get the scroll offset for the visible part of the scrolled area. + * + * \param scrollbar the scrollbar to get the scroll offset value from + * \return scroll offset for the scrolled area + */ + +int scrollbar_get_offset(struct scrollbar *scrollbar) +{ + if (scrollbar == NULL) + return 0; + return scrollbar->area_scroll; +} + + +/** + * Set the length of the scrollbar and the visible or scrolled part of the + * scrolled area. + * + * \param scrollbar the scrollbar to set the values for + * \param length -1 or the new scrollbar length to be set + * \param scrolled_visible -1 or the new value of the visible part of the + * scrolled area to be set + * \param scrolled_dimension -1 or the new dimension of the scrolled content + */ + +void scrollbar_set_extents(struct scrollbar *scrollbar, int length, + int scrolled_visible, int scrolled_dimension) +{ + int well_length; + + if (length != -1) + scrollbar->length = length; + if (scrolled_visible != -1) + scrollbar->scrolled_vis = scrolled_visible; + if (scrolled_dimension != -1) + scrollbar->scrolled_d = scrolled_dimension; + + well_length = length - 2 * SCROLLBAR_WIDTH; + + scrollbar->bar_len = (well_length * scrolled_visible) / + scrollbar->scrolled_d; + scrollbar->bar_off = (well_length * scrollbar->area_scroll) / + scrollbar->scrolled_d; +} + + +/** + * Check the orientation of the scrollbar. + * + * \param scrollbar the scrollbar to check the orientation of + * \return true for a horizontal scrollbar, else false (vertical + */ + +bool scrollbar_is_horizontal(struct scrollbar *scrollbar) +{ + return scrollbar->horizontal; +} + + +/** + * Internal procedure used for starting a drag scroll for a scrollbar. + * + * \param scrollbar the scrollbar to start the drag for + * \param x the X coordinate of the drag start + * \param y the Y coordinate of the drag start + * \param reverse whether this should be a reverse drag (used when the + * user drags the content area, rather than the scrollbar) + * \param pair whether the drag is a '2D' scroll + */ + +static void scrollbar_drag_start_internal(struct scrollbar *scrollbar, + int x, int y, bool reverse, bool pair) +{ + struct scrollbar_msg_data msg; + + scrollbar->drag_start_coord = scrollbar->horizontal ? x : y; + scrollbar->drag_start_bar_off = scrollbar->bar_off; + + scrollbar->dragging = true; + scrollbar->reverse = reverse; + + msg.scrollbar = scrollbar; + + /* \todo - some proper numbers please! */ + if (scrollbar->horizontal) { + msg.x0 = -1024; + msg.x1 = 1024; + msg.y0 = 0; + msg.y1 = 0; + } else { + msg.x0 = 0; + msg.x1 = 0; + msg.y0 = -1024; + msg.y1 = 1024; + } + + if (pair && scrollbar->pair != NULL) { + scrollbar->pair_drag = true; + + scrollbar->pair->drag_start_coord = + scrollbar->pair->horizontal ? x : y; + + scrollbar->pair->drag_start_bar_off = scrollbar->pair->bar_off; + + scrollbar->pair->dragging = true; + scrollbar->pair->reverse = reverse; + + if (scrollbar->pair->horizontal) { + msg.x0 = -1024; + msg.x1 = 1024; + } else { + msg.y0 = -1024; + msg.y1 = 1024; + } + } + msg.msg = SCROLLBAR_MSG_SCROLL_START; + scrollbar->client_callback(scrollbar->client_data, &msg); +} + + +/** + * Handle mouse actions other then drag ends. + * + * \param scrollbar the scrollbar which gets the mouse action + * \param mouse mouse state + * \param x X coordinate of the mouse + * \param y Y coordinate of the mouse + * \return message for the status bar or NULL on failure + */ + +const char *scrollbar_mouse_action(struct scrollbar *scrollbar, + browser_mouse_state mouse, int x, int y) +{ + int x0, y0, x1, y1; + int val; + const char *status; + bool h; + + /* we want mouse presses and mouse drags that were not started at the + * scrollbar indication bar to be launching actions on the scroll area + */ + bool but1 = ((mouse & BROWSER_MOUSE_PRESS_1) || + ((mouse & BROWSER_MOUSE_HOLDING_1) && + (mouse & BROWSER_MOUSE_DRAG_ON) && + !scrollbar->dragging)); + bool but2 = ((mouse & BROWSER_MOUSE_PRESS_2) || + ((mouse & BROWSER_MOUSE_HOLDING_2) && + (mouse & BROWSER_MOUSE_DRAG_ON) && + !scrollbar->dragging)); + + h = scrollbar->horizontal; + + x0 = 0; + y0 = 0; + x1 = h ? scrollbar->length : SCROLLBAR_WIDTH; + y1 = h ? SCROLLBAR_WIDTH : scrollbar->length; + + if (!scrollbar->dragging && + !(x >= x0 && x <= x1 && y >= y0 && y <= y1)) { + /* Not a drag and mouse outside scrollbar widget */ + return NULL; + } + + + if (h) + val = x; + else + val = y; + + if (scrollbar->dragging) { + val -= scrollbar->drag_start_coord; + if (scrollbar->reverse) + val = -val; + if (val != 0) + scrollbar_set(scrollbar, + scrollbar->drag_start_bar_off + val, + true); + if (scrollbar->pair_drag) { + scrollbar_mouse_action(scrollbar->pair, mouse, x, y); + status = messages_get("ScrollBoth"); + } else + status = messages_get(h ? "ScrollH" : "ScrollV"); + + return status; + } + + if (val < SCROLLBAR_WIDTH) { + /* left/up arrow */ + + status = messages_get(h ? "ScrollLeft" : "ScrollUp"); + if (but1) + scrollbar_set(scrollbar, + scrollbar->bar_off - SCROLLBAR_WIDTH, + true); + else if (but2) + scrollbar_set(scrollbar, + scrollbar->bar_off + SCROLLBAR_WIDTH, + true); + + } else if (val < SCROLLBAR_WIDTH + scrollbar->bar_off) { + /* well between left/up arrow and bar */ + + status = messages_get(h ? "ScrollPLeft" : "ScrollPUp"); + + if (but1) + scrollbar_set(scrollbar, + scrollbar->area_scroll - scrollbar->length, + false); + else if (but2) + scrollbar_set(scrollbar, + scrollbar->area_scroll + scrollbar->length, + false); + + } else if (val > scrollbar->length - SCROLLBAR_WIDTH) { + /* right/down arrow */ + + status = messages_get(h ? "ScrollRight" : "ScrollDown"); + + if (but1) + scrollbar_set(scrollbar, + scrollbar->bar_off + SCROLLBAR_WIDTH, + true); + else if (but2) + scrollbar_set(scrollbar, + scrollbar->bar_off - SCROLLBAR_WIDTH, + true); + + } else if (val > SCROLLBAR_WIDTH + scrollbar->bar_off + scrollbar->bar_len) { + /* well between right/down arrow and bar */ + + status = messages_get(h ? "ScrollPRight" : "ScrollPDown"); + if (but1) + scrollbar_set(scrollbar, + scrollbar->area_scroll + scrollbar->length, + false); + else if (but2) + scrollbar_set(scrollbar, + scrollbar->area_scroll - scrollbar->length, + false); + } + else { + /* scrollbar position indication bar */ + + status = messages_get(h ? "ScrollH" : "ScrollV"); + } + + + if (mouse & (BROWSER_MOUSE_DRAG_1 | BROWSER_MOUSE_DRAG_2) && + (val >= SCROLLBAR_WIDTH + scrollbar->bar_off + && val < SCROLLBAR_WIDTH + scrollbar->bar_off + + scrollbar->bar_len)) + /* The mouse event is a drag start on the scrollbar position + * indication bar. */ + scrollbar_drag_start_internal(scrollbar, x, y, false, + (mouse & BROWSER_MOUSE_DRAG_2) ? true : false); + + return status; +} + + +/** + * Handle end of mouse drags. + * + * \param scrollbar the scrollbar for which the drag ends + * \param mouse mouse state + * \param x X coordinate of the mouse + * \param y Y coordinate of the mouse + */ + +void scrollbar_mouse_drag_end(struct scrollbar *scrollbar, + browser_mouse_state mouse, int x, int y) +{ + struct scrollbar_msg_data msg; + int val; + + assert(scrollbar->dragging); + + val = (scrollbar->horizontal ? x : y) - scrollbar->drag_start_coord; + if (scrollbar->reverse) + val = -val; + if (val != 0) + scrollbar_set(scrollbar, scrollbar->drag_start_bar_off + val, + true); + + scrollbar->dragging = false; + scrollbar->reverse = false; + if (scrollbar->pair_drag) { + scrollbar->pair_drag = false; + + val = (scrollbar->pair->horizontal ? x : y) - + scrollbar->pair->drag_start_coord; + if (scrollbar->pair->reverse) + val = -val; + if (val != 0) + scrollbar_set(scrollbar->pair, + scrollbar->pair->drag_start_bar_off + val, + true); + + scrollbar->pair->dragging = false; + scrollbar->pair->reverse = false; + } + msg.scrollbar = scrollbar; + msg.msg = SCROLLBAR_MSG_SCROLL_FINISHED; + scrollbar->client_callback(scrollbar->client_data, &msg); +} + + +/** + * Called when the content is being dragged to the scrollbars have to adjust. + * If the content has both scrollbars, and scrollbar_make_pair has beed called + * before, only the one scroll which will receive further mouse events has to be + * passed. + * + * \param scrollbar one of the the scrollbars owned by the dragged content + * \param x X coordinate of mouse during drag start + * \param y Y coordinate of mouse during drag start + */ + +void scrollbar_start_content_drag(struct scrollbar *scrollbar, int x, int y) +{ + scrollbar_drag_start_internal(scrollbar, x, y, true, true); +} + + +/** + * Connect a horizontal and a vertical scrollbar into a pair so that they + * co-operate during 2D drags. + * + * \param horizontal_scrollbar the scrollbar used for horizontal scrolling + * \param vertical_scrollbar the scrollbar used for vertical scrolling + */ + +void scrollbar_make_pair(struct scrollbar *horizontal_scrollbar, + struct scrollbar *vertical_scrollbar) +{ + assert(horizontal_scrollbar->horizontal && + !vertical_scrollbar->horizontal); + + horizontal_scrollbar->pair = vertical_scrollbar; + vertical_scrollbar->pair = horizontal_scrollbar; +} + + +void *scrollbar_get_data(struct scrollbar *scrollbar) +{ + return scrollbar->client_data; +} + |