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eeshow/: add panning (middle mouse button)

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This commit is contained in:
Werner Almesberger 2016-08-03 09:57:58 -03:00
parent e2ff07457c
commit c8b8dbd174
1 changed files with 23 additions and 5 deletions
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28
eeshow/gui.c
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@ -103,16 +103,32 @@ static void canvas_coord(const struct gui_ctx *ctx,
static void pan_begin(struct gui_ctx *ctx, int x, int y)
{
if (ctx->panning)
return;
ctx->panning = 1;
ctx->pan_x = x;
ctx->pan_y = y;
}
static void pan_update(struct gui_ctx *ctx, int x, int y)
{
if (!ctx->panning)
return;
ctx->x -= (x - ctx->pan_x) << ctx->zoom;
ctx->y -= (y - ctx->pan_y) << ctx->zoom;
ctx->pan_x = x;
ctx->pan_y = y;
gtk_widget_queue_draw(ctx->da);
}
static void pan_end(struct gui_ctx *ctx, int x, int y)
{
pan_update(ctx, x, y);
ctx->panning = 0;
}
@ -153,7 +169,7 @@ static gboolean motion_notify_event(GtkWidget *widget, GdkEventMotion *event,
canvas_coord(ctx, event->x, event->y, &x, &y);
// fprintf(stderr, "motion\n");
pan_update(ctx, x, y);
pan_update(ctx, event->x, event->y);
return TRUE;
}
@ -168,11 +184,12 @@ static gboolean button_press_event(GtkWidget *widget, GdkEventButton *event,
fprintf(stderr, "button press\n");
switch (event->button) {
case 1:
break;
case 2:
pan_begin(ctx, x, y);
pan_begin(ctx, event->x, event->y);
break;
case 3:
;
break;
}
return TRUE;
}
@ -188,11 +205,12 @@ static gboolean button_release_event(GtkWidget *widget, GdkEventButton *event,
fprintf(stderr, "button release\n");
switch (event->button) {
case 1:
break;
case 2:
pan_end(ctx, x, y);
pan_end(ctx, event->x, event->y);
break;
case 3:
;
break;
}
return TRUE;
}