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Implemented support for mouse scrolling in weston-terminal

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[Pekka Paalanen: fixed some code style issues]
This commit is contained in:
Magnus Hoff
2014-08-05 15:05:59 +02:00
committed by Pekka Paalanen
parent 45ee1f9ef7
commit 1046f121f7
1 changed files with 51 additions and 0 deletions
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clients/terminal.c
+51
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@@ -447,6 +447,7 @@ struct terminal {
int width, height, row, column, max_width;
uint32_t buffer_height;
uint32_t start, end, saved_start, log_size;
wl_fixed_t smooth_scroll;
int saved_row, saved_column;
int scrolling;
int send_cursor_position;
@@ -2785,6 +2786,55 @@ motion_handler(struct widget *widget,
return CURSOR_IBEAM;
}
/* This magnitude is chosen rather arbitrarily. Really, the scrolling
* should happen on a (fractional) pixel basis, not a line basis. */
#define AXIS_UNITS_PER_LINE 256
static void
axis_handler(struct widget *widget,
struct input *input, uint32_t time,
uint32_t axis,
wl_fixed_t value,
void *data)
{
struct terminal *terminal = data;
int lines;
if (axis != WL_POINTER_AXIS_VERTICAL_SCROLL)
return;
terminal->smooth_scroll += value;
lines = terminal->smooth_scroll / AXIS_UNITS_PER_LINE;
terminal->smooth_scroll -= lines * AXIS_UNITS_PER_LINE;
if (lines > 0) {
if (terminal->scrolling) {
if ((uint32_t)lines > terminal->saved_start - terminal->start)
lines = terminal->saved_start - terminal->start;
} else {
lines = 0;
}
} else if (lines < 0) {
uint32_t neg_lines = -lines;
if (neg_lines > terminal->log_size + terminal->start - terminal->end)
lines = terminal->end - terminal->log_size - terminal->start;
}
if (lines) {
if (!terminal->scrolling)
terminal->saved_start = terminal->start;
terminal->scrolling = 1;
terminal->start += lines;
terminal->row -= lines;
terminal->selection_start_row -= lines;
terminal->selection_end_row -= lines;
widget_schedule_redraw(widget);
}
}
static void
output_handler(struct window *window, struct output *output, int enter,
void *data)
@@ -2880,6 +2930,7 @@ terminal_create(struct display *display)
widget_set_button_handler(terminal->widget, button_handler);
widget_set_enter_handler(terminal->widget, enter_handler);
widget_set_motion_handler(terminal->widget, motion_handler);
widget_set_axis_handler(terminal->widget, axis_handler);
widget_set_touch_up_handler(terminal->widget, touch_up_handler);
widget_set_touch_down_handler(terminal->widget, touch_down_handler);
widget_set_touch_motion_handler(terminal->widget, touch_motion_handler);