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https://github.com/netsurf-browser/netsurf
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Continue improving comments. Fix bugs in scrollbar_set_extents. Rename things so their name matches what they are.
svn path=/trunk/netsurf/; revision=12368
This commit is contained in:
Michael Drake
parent
e23fdcae82
commit
4d8201b8ca
@ -39,11 +39,12 @@ struct scrollbar {
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*/
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int length; /* Length of the scrollbar widget */
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int scrolled_d; /* The dimension of the scrolled area */
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int scrolled_vis; /* The visible part of the scrolled area */
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int full_size; /* Length of the full scrollable area */
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int visible_size; /* Length visible part of the scrollable area */
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int area_scroll; /* Scroll value of the scrolled area */
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int bar_off; /* Offset of the scrollbar */
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int offset; /* Current scroll offset to visible area */
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int bar_pos; /* Position of the scrollbar */
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int bar_len; /* Length of the scrollbar */
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scrollbar_client_callback client_callback; /* Callback receiving
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@ -52,7 +53,7 @@ struct scrollbar {
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bool dragging; /* Flag indicating drag at progess */
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int drag_start_coord; /* Coordinate value at drag start */
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int drag_start_bar_off; /* Scrollbar offset at drag start */
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int drag_start_bar_pos; /* Scrollbar offset at drag start */
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bool reverse; /* Flag indicating that the scrollbar moves
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* in the opposite direction to the mouse
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*/
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@ -109,10 +110,10 @@ bool scrollbar_create(bool horizontal, int length,
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scrollbar->horizontal = horizontal;
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scrollbar->length = length;
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scrollbar->scrolled_d = scrolled_dimension;
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scrollbar->scrolled_vis = scrolled_visible;
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scrollbar->area_scroll = 0;
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scrollbar->bar_off = 0;
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scrollbar->full_size = scrolled_dimension;
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scrollbar->visible_size = scrolled_visible;
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scrollbar->offset = 0;
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scrollbar->bar_pos = 0;
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scrollbar->reverse = false;
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scrollbar->pair = NULL;
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scrollbar->pair_drag = false;
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@ -213,7 +214,7 @@ bool scrollbar_redraw(struct scrollbar *scrollbar, int x, int y,
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const struct rect *clip, float scale)
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{
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int w = SCROLLBAR_WIDTH;
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int well_length, bar_off, bar_c0, bar_c1;
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int well_length, bar_pos, bar_c0, bar_c1;
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int v[6]; /* array of triangle vertices */
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int x0, y0, x1, y1;
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@ -237,9 +238,9 @@ bool scrollbar_redraw(struct scrollbar *scrollbar, int x, int y,
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scrollbar->length : SCROLLBAR_WIDTH) - 1;
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y1 = y + (scrollbar->horizontal ?
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SCROLLBAR_WIDTH : scrollbar->length) - 1;
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bar_off = scrollbar->bar_off;
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bar_pos = scrollbar->bar_pos;
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bar_c1 = (scrollbar->horizontal ? x0 : y0) + SCROLLBAR_WIDTH +
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scrollbar->bar_off + scrollbar->bar_len - 1;
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scrollbar->bar_pos + scrollbar->bar_len - 1;
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if (scale != 1.0) {
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w *= scale;
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@ -248,11 +249,11 @@ bool scrollbar_redraw(struct scrollbar *scrollbar, int x, int y,
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y0 *= scale;
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x1 *= scale;
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y1 *= scale;
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bar_off *= scale;
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bar_pos *= scale;
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bar_c1 *= scale;
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}
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bar_c0 = (scrollbar->horizontal ? x0 : y0) + w + bar_off;
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bar_c0 = (scrollbar->horizontal ? x0 : y0) + w + bar_pos;
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if (x1 < clip->x0 || y1 < clip->y0 || clip->x1 < x0 || clip->y1 < y0)
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/* scrollbar is outside the clipping rectangle, nothing to
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@ -429,36 +430,35 @@ void scrollbar_set(struct scrollbar *scrollbar, int scroll_val, bool bar_pos)
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if (scroll_val < 0)
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scroll_val = 0;
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if (scrollbar->scrolled_d == scrollbar->scrolled_vis)
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if (scrollbar->full_size == scrollbar->visible_size)
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return;
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well_length = scrollbar->length - 2 * SCROLLBAR_WIDTH;
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if (bar_pos) {
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if (scroll_val > well_length - scrollbar->bar_len)
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scrollbar->bar_off = well_length - scrollbar->bar_len;
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scrollbar->bar_pos = well_length - scrollbar->bar_len;
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else
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scrollbar->bar_off = scroll_val;
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scrollbar->bar_pos = scroll_val;
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scrollbar->area_scroll = ((scrollbar->scrolled_d -
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scrollbar->scrolled_vis) *
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(scrollbar->bar_off)) /
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scrollbar->offset = ((scrollbar->full_size -
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scrollbar->visible_size) *
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(scrollbar->bar_pos)) /
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(well_length - scrollbar->bar_len);
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} else {
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if (scroll_val > scrollbar->scrolled_d -
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scrollbar->scrolled_vis)
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scrollbar->area_scroll = scrollbar->scrolled_d -
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scrollbar->scrolled_vis;
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if (scroll_val > scrollbar->full_size - scrollbar->visible_size)
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scrollbar->offset = scrollbar->full_size -
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scrollbar->visible_size;
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else
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scrollbar->area_scroll = scroll_val;
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scrollbar->offset = scroll_val;
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scrollbar->bar_off = (well_length * scrollbar->area_scroll) /
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scrollbar->scrolled_d;
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scrollbar->bar_pos = (well_length * scrollbar->offset) /
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scrollbar->full_size;
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}
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msg.scrollbar = scrollbar;
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msg.msg = SCROLLBAR_MSG_MOVED;
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msg.new_scroll = scrollbar->area_scroll;
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msg.new_scroll = scrollbar->offset;
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scrollbar->client_callback(scrollbar->client_data, &msg);
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msg.msg = SCROLLBAR_MSG_REDRAW;
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@ -476,29 +476,28 @@ void scrollbar_set(struct scrollbar *scrollbar, int scroll_val, bool bar_pos)
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/**
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* Get the scroll offset for the visible part of the scrolled area.
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* Get the current scroll offset to the visible part of the full area.
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*
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* \param scrollbar the scrollbar to get the scroll offset value from
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* \return scroll offset for the scrolled area
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* \return current scroll offset
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*/
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int scrollbar_get_offset(struct scrollbar *scrollbar)
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{
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if (scrollbar == NULL)
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return 0;
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return scrollbar->area_scroll;
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return scrollbar->offset;
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}
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/**
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* Set the length of the scrollbar and the visible or scrolled part of the
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* scrolled area.
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* Set the length of the scrollbar widget, the size of the visible area, and the
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* size of the full area.
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*
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* \param scrollbar the scrollbar to set the values for
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* \param length -1 or the new scrollbar length to be set
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* \param scrolled_visible -1 or the new value of the visible part of the
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* scrolled area to be set
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* \param scrolled_dimension -1 or the new dimension of the scrolled content
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* \param length -1 or the new scrollbar widget length
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* \param scrolled_visible -1 or the new size of the visible area
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* \param scrolled_dimension -1 or the new size of the full contained area
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*/
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void scrollbar_set_extents(struct scrollbar *scrollbar, int length,
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@ -506,27 +505,29 @@ void scrollbar_set_extents(struct scrollbar *scrollbar, int length,
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{
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int well_length;
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/* TODO: update offset appropriately */
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if (length != -1)
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scrollbar->length = length;
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if (scrolled_visible != -1)
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scrollbar->scrolled_vis = scrolled_visible;
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scrollbar->visible_size = scrolled_visible;
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if (scrolled_dimension != -1)
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scrollbar->scrolled_d = scrolled_dimension;
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well_length = length - 2 * SCROLLBAR_WIDTH;
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scrollbar->full_size = scrolled_dimension;
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scrollbar->bar_len = (well_length * scrolled_visible) /
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scrollbar->scrolled_d;
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scrollbar->bar_off = (well_length * scrollbar->area_scroll) /
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scrollbar->scrolled_d;
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well_length = scrollbar->length - 2 * SCROLLBAR_WIDTH;
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scrollbar->bar_len = (well_length * scrollbar->visible_size) /
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scrollbar->full_size;
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scrollbar->bar_pos = (well_length * scrollbar->offset) /
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scrollbar->full_size;
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}
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/**
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* Check the orientation of the scrollbar.
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* Check orientation of the scrollbar.
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*
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* \param scrollbar the scrollbar to check the orientation of
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* \return true for a horizontal scrollbar, else false (vertical
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* \return true for a horizontal scrollbar, else false (vertical)
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*/
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bool scrollbar_is_horizontal(struct scrollbar *scrollbar)
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@ -552,7 +553,7 @@ static void scrollbar_drag_start_internal(struct scrollbar *scrollbar,
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struct scrollbar_msg_data msg;
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scrollbar->drag_start_coord = scrollbar->horizontal ? x : y;
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scrollbar->drag_start_bar_off = scrollbar->bar_off;
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scrollbar->drag_start_bar_pos = scrollbar->bar_pos;
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scrollbar->dragging = true;
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scrollbar->reverse = reverse;
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@ -578,7 +579,7 @@ static void scrollbar_drag_start_internal(struct scrollbar *scrollbar,
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scrollbar->pair->drag_start_coord =
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scrollbar->pair->horizontal ? x : y;
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scrollbar->pair->drag_start_bar_off = scrollbar->pair->bar_off;
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scrollbar->pair->drag_start_bar_pos = scrollbar->pair->bar_pos;
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scrollbar->pair->dragging = true;
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scrollbar->pair->reverse = reverse;
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@ -651,7 +652,7 @@ const char *scrollbar_mouse_action(struct scrollbar *scrollbar,
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val = -val;
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if (val != 0)
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scrollbar_set(scrollbar,
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scrollbar->drag_start_bar_off + val,
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scrollbar->drag_start_bar_pos + val,
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true);
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if (scrollbar->pair_drag) {
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scrollbar_mouse_action(scrollbar->pair, mouse, x, y);
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@ -668,25 +669,25 @@ const char *scrollbar_mouse_action(struct scrollbar *scrollbar,
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status = messages_get(h ? "ScrollLeft" : "ScrollUp");
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if (but1)
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scrollbar_set(scrollbar,
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scrollbar->bar_off - SCROLLBAR_WIDTH,
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scrollbar->bar_pos - SCROLLBAR_WIDTH,
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true);
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else if (but2)
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scrollbar_set(scrollbar,
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scrollbar->bar_off + SCROLLBAR_WIDTH,
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scrollbar->bar_pos + SCROLLBAR_WIDTH,
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true);
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} else if (val < SCROLLBAR_WIDTH + scrollbar->bar_off) {
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} else if (val < SCROLLBAR_WIDTH + scrollbar->bar_pos) {
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/* well between left/up arrow and bar */
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status = messages_get(h ? "ScrollPLeft" : "ScrollPUp");
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if (but1)
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scrollbar_set(scrollbar,
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scrollbar->area_scroll - scrollbar->length,
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scrollbar->offset - scrollbar->length,
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false);
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else if (but2)
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scrollbar_set(scrollbar,
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scrollbar->area_scroll + scrollbar->length,
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scrollbar->offset + scrollbar->length,
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false);
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} else if (val > scrollbar->length - SCROLLBAR_WIDTH) {
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@ -696,24 +697,25 @@ const char *scrollbar_mouse_action(struct scrollbar *scrollbar,
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if (but1)
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scrollbar_set(scrollbar,
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scrollbar->bar_off + SCROLLBAR_WIDTH,
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scrollbar->bar_pos + SCROLLBAR_WIDTH,
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true);
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else if (but2)
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scrollbar_set(scrollbar,
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scrollbar->bar_off - SCROLLBAR_WIDTH,
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scrollbar->bar_pos - SCROLLBAR_WIDTH,
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true);
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} else if (val > SCROLLBAR_WIDTH + scrollbar->bar_off + scrollbar->bar_len) {
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} else if (val > SCROLLBAR_WIDTH + scrollbar->bar_pos +
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scrollbar->bar_len) {
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/* well between right/down arrow and bar */
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status = messages_get(h ? "ScrollPRight" : "ScrollPDown");
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if (but1)
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scrollbar_set(scrollbar,
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scrollbar->area_scroll + scrollbar->length,
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scrollbar->offset + scrollbar->length,
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false);
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else if (but2)
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scrollbar_set(scrollbar,
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scrollbar->area_scroll - scrollbar->length,
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scrollbar->offset - scrollbar->length,
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false);
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}
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else {
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@ -724,8 +726,8 @@ const char *scrollbar_mouse_action(struct scrollbar *scrollbar,
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if (mouse & (BROWSER_MOUSE_DRAG_1 | BROWSER_MOUSE_DRAG_2) &&
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(val >= SCROLLBAR_WIDTH + scrollbar->bar_off
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&& val < SCROLLBAR_WIDTH + scrollbar->bar_off +
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(val >= SCROLLBAR_WIDTH + scrollbar->bar_pos
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&& val < SCROLLBAR_WIDTH + scrollbar->bar_pos +
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scrollbar->bar_len))
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/* The mouse event is a drag start on the scrollbar position
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* indication bar. */
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@ -757,7 +759,7 @@ void scrollbar_mouse_drag_end(struct scrollbar *scrollbar,
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if (scrollbar->reverse)
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val = -val;
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if (val != 0)
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scrollbar_set(scrollbar, scrollbar->drag_start_bar_off + val,
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scrollbar_set(scrollbar, scrollbar->drag_start_bar_pos + val,
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true);
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scrollbar->dragging = false;
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@ -771,7 +773,7 @@ void scrollbar_mouse_drag_end(struct scrollbar *scrollbar,
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val = -val;
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if (val != 0)
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scrollbar_set(scrollbar->pair,
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scrollbar->pair->drag_start_bar_off + val,
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scrollbar->pair->drag_start_bar_pos + val,
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true);
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scrollbar->pair->dragging = false;
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