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[STR New]
Link: http://www.fltk.org/str.php?L2857
Version: 1.3-current
There are two helper functions in screen_xywh that returns the "work area"
and "screen" where the mouse pointer is located. However, these initially
returns incorrect data when the application starts on a secondary screen.
This is because they are using the e_x_root/e_y_root variables, but these
cannot be trusted until a mouse or keyboard event has happened. As the
comment in Fl.H points out:
/**
Return where the mouse is on the screen by doing a round-trip query to
the server. You should use Fl::event_x_root() and
Fl::event_y_root() if possible, but this is necessary if you are
not sure if a mouse event has been processed recently (such as to
position your first window). If the display is not open, this will
open it.
*/
static void get_mouse(int &,int &); // platform dependent
The bug is visible with the "fullscreen" test program. When starting it on
a secondary screen, you have to press "Update" to get the correct values
for "Mouse screen work area". Attaching patch.
Link: http://www.fltk.org/str.php?L2857
Version: 1.3-currentIndex: FL/Fl.H
===================================================================
--- FL/Fl.H (revision 9629)
+++ FL/Fl.H (arbetskopia)
@@ -785,7 +785,9 @@
\see void screen_xywh(int &x, int &y, int &w, int &h, int mx, int my)
*/
static void screen_xywh(int &X, int &Y, int &W, int &H) {
- screen_xywh(X, Y, W, H, e_x_root, e_y_root);
+ int x_root, y_root;
+ Fl::get_mouse(x_root, y_root);
+ screen_xywh(X, Y, W, H, x_root, y_root);
}
static void screen_xywh(int &X, int &Y, int &W, int &H, int mx, int my);
static void screen_xywh(int &X, int &Y, int &W, int &H, int n);
@@ -799,7 +801,9 @@
\see void screen_work_area(int &x, int &y, int &w, int &h, int mx, int my)
*/
static void screen_work_area(int &X, int &Y, int &W, int &H) {
- screen_work_area(X, Y, W, H, e_x_root, e_y_root);
+ int x_root, y_root;
+ Fl::get_mouse(x_root, y_root);
+ screen_work_area(X, Y, W, H, x_root, y_root);
}
/** @} */
Index: test/fullscreen.cxx
===================================================================
--- test/fullscreen.cxx (revision 9629)
+++ test/fullscreen.cxx (arbetskopia)
@@ -199,6 +199,9 @@
sprintf(line, "Main screen work area: %dx%d@%d,%d", Fl::w(), Fl::h(),
Fl::x(), Fl::y());
browser->add(line);
+ Fl::screen_xywh(x, y, w, h);
+ sprintf(line, "Mouse screen: %dx%d@%d,%d", w, h, x, y);
+ browser->add(line);
Fl::screen_work_area(x, y, w, h);
sprintf(line, "Mouse screen work area: %dx%d@%d,%d", w, h, x, y);
browser->add(line);
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