clients: Add motion event trails to clickdot

Useful for testing pointer device.

Signed-off-by: Jonas Ådahl <jadahl@gmail.com>

diff --git a/clients/clickdot.c b/clients/clickdot.c
index 6d70618..d1f8e2e 100644 (file)
--- a/clients/clickdot.c
+++ b/clients/clickdot.c
@@ -1,6 +1,7 @@
 /*
  * Copyright © 2010 Intel Corporation
  * Copyright © 2012 Collabora, Ltd.
+ * Copyright © 2012 Jonas Ådahl
  *
  * Permission to use, copy, modify, distribute, and sell this software and its
  * documentation for any purpose is hereby granted without fee, provided that
@@ -41,10 +42,96 @@ struct clickdot {
        struct window *window;
        struct widget *widget;
 
-       int32_t x, y;
+       cairo_surface_t *buffer;
+
+       struct {
+               int32_t x, y;
+       } dot;
+
+       struct {
+               int32_t x, y;
+               int32_t old_x, old_y;
+       } line;
+
+       int reset;
 };
 
 static void
+draw_line(struct clickdot *clickdot, cairo_t *cr,
+         struct rectangle *allocation)
+{
+       cairo_t *bcr;
+       cairo_surface_t *tmp_buffer = NULL;
+
+       if (clickdot->reset) {
+               tmp_buffer = clickdot->buffer;
+               clickdot->buffer = NULL;
+               clickdot->line.x = -1;
+               clickdot->line.y = -1;
+               clickdot->line.old_x = -1;
+               clickdot->line.old_y = -1;
+               clickdot->reset = 0;
+       }
+
+       if (clickdot->buffer == NULL) {
+               clickdot->buffer =
+                       cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
+                                                  allocation->width,
+                                                  allocation->height);
+               bcr = cairo_create(clickdot->buffer);
+               cairo_set_source_rgba(bcr, 0, 0, 0, 0);
+               cairo_rectangle(bcr,
+                               0, 0,
+                               allocation->width, allocation->height);
+               cairo_fill(bcr);
+       }
+       else
+               bcr = cairo_create(clickdot->buffer);
+
+       if (tmp_buffer) {
+               cairo_set_source_surface(bcr, tmp_buffer, 0, 0);
+               cairo_rectangle(bcr, 0, 0,
+                               allocation->width, allocation->height);
+               cairo_clip(bcr);
+               cairo_paint(bcr);
+
+               cairo_surface_destroy(tmp_buffer);
+       }
+
+       if (clickdot->line.x != -1 && clickdot->line.y != -1) {
+               if (clickdot->line.old_x != -1 &&
+                   clickdot->line.old_y != -1) {
+                       cairo_set_line_width(bcr, 2.0);
+                       cairo_set_source_rgb(bcr, 1, 1, 1);
+                       cairo_translate(bcr,
+                                       -allocation->x, -allocation->y);
+
+                       cairo_move_to(bcr,
+                                     clickdot->line.old_x,
+                                     clickdot->line.old_y);
+                       cairo_line_to(bcr,
+                                     clickdot->line.x,
+                                     clickdot->line.y);
+
+                       cairo_stroke(bcr);
+               }
+
+               clickdot->line.old_x = clickdot->line.x;
+               clickdot->line.old_y = clickdot->line.y;
+       }
+       cairo_destroy(bcr);
+
+       cairo_set_source_surface(cr, clickdot->buffer,
+                                allocation->x, allocation->y);
+       cairo_set_operator(cr, CAIRO_OPERATOR_ADD);
+       cairo_rectangle(cr,
+                       allocation->x, allocation->y,
+                       allocation->width, allocation->height);
+       cairo_clip(cr);
+       cairo_paint(cr);
+}
+
+static void
 redraw_handler(struct widget *widget, void *data)
 {
        static const double r = 10.0;
@@ -67,7 +154,9 @@ redraw_handler(struct widget *widget, void *data)
        cairo_set_source_rgba(cr, 0, 0, 0, 0.8);
        cairo_fill(cr);
 
-       cairo_translate(cr, clickdot->x + 0.5, clickdot->y + 0.5);
+       draw_line(clickdot, cr, &allocation);
+
+       cairo_translate(cr, clickdot->dot.x + 0.5, clickdot->dot.y + 0.5);
        cairo_set_line_width(cr, 1.0);
        cairo_set_source_rgb(cr, 0.1, 0.9, 0.9);
        cairo_move_to(cr, 0.0, -r);
@@ -115,11 +204,44 @@ button_handler(struct widget *widget,
        struct clickdot *clickdot = data;
 
        if (state && button == BTN_LEFT)
-               input_get_position(input, &clickdot->x, &clickdot->y);
+               input_get_position(input, &clickdot->dot.x, &clickdot->dot.y);
 
        widget_schedule_redraw(widget);
 }
 
+static int
+motion_handler(struct widget *widget,
+              struct input *input, uint32_t time,
+              float x, float y, void *data)
+{
+       struct clickdot *clickdot = data;
+       clickdot->line.x = x;
+       clickdot->line.y = y;
+
+       window_schedule_redraw(clickdot->window);
+
+       return POINTER_LEFT_PTR;
+}
+
+static void
+resize_handler(struct widget *widget,
+              int32_t width, int32_t height,
+              void *data)
+{
+       struct clickdot *clickdot = data;
+
+       clickdot->reset = 1;
+}
+
+static void
+leave_handler(struct widget *widget,
+             struct input *input, void *data)
+{
+       struct clickdot *clickdot = data;
+
+       clickdot->reset = 1;
+}
+
 static struct clickdot *
 clickdot_create(struct display *display)
 {
@@ -134,6 +256,7 @@ clickdot_create(struct display *display)
        clickdot->widget = frame_create(clickdot->window, clickdot);
        window_set_title(clickdot->window, "Wayland ClickDot");
        clickdot->display = display;
+       clickdot->buffer = NULL;
 
        window_set_key_handler(clickdot->window, key_handler);
        window_set_user_data(clickdot->window, clickdot);
@@ -142,10 +265,18 @@ clickdot_create(struct display *display)
 
        widget_set_redraw_handler(clickdot->widget, redraw_handler);
        widget_set_button_handler(clickdot->widget, button_handler);
+       widget_set_motion_handler(clickdot->widget, motion_handler);
+       widget_set_resize_handler(clickdot->widget, resize_handler);
+       widget_set_leave_handler(clickdot->widget, leave_handler);
 
        widget_schedule_resize(clickdot->widget, 500, 400);
-       clickdot->x = 250;
-       clickdot->y = 200;
+       clickdot->dot.x = 250;
+       clickdot->dot.y = 200;
+       clickdot->line.x = -1;
+       clickdot->line.y = -1;
+       clickdot->line.old_x = -1;
+       clickdot->line.old_y = -1;
+       clickdot->reset = 0;
 
        return clickdot;
 }
@@ -153,6 +284,8 @@ clickdot_create(struct display *display)
 static void
 clickdot_destroy(struct clickdot *clickdot)
 {
+       if (clickdot->buffer)
+               cairo_surface_destroy(clickdot->buffer);
        widget_destroy(clickdot->widget);
        window_destroy(clickdot->window);
        free(clickdot);