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window: Assume CSD frame extents are 0 in maximized and tiling modes

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When the user maximized a CSD window, this is the order of operations
that happens:

  1. The CSD application sends us a _NET_WM_STATE client message telling
     us to add the _NET_WM_MAXIMIZED_VERT/HORZ state.

  2. We respond by setting _NET_WM_STATE on the window and resizing the
     window. Windows are positioned according to the visible borders of
     the window, so since _GTK_FRAME_EXTENTS has not been updated yet to
     reflect the border/padding of the window state, the borders are wrong.

  3. GTK+ gets the _NET_WM_STATE event, updates its state, and then sets
     new theme properties, including _GTK_FRAME_EXTENTS.

  4. mutter sees that _GTK_FRAME_EXTENTS has been updated, and repositions
     the window to where it should be.

This means that the user sees the borders "flicker" for a half-second while
the maximization state is in limbo. Trying to make this resize operation
atomic is a foregone conclusion under X11, so to solve this, we're going to
make two changes to our _GTK_FRAME_EXTENTS protocol:

  1. _GTK_FRAME_EXTENTS now reflects the "normal" borders, always. This
     means that _GTK_FRAME_EXTENTS should not change at runtime unless the
     theme changes.

  2. mutter will only respect _GTK_FRAME_EXTENTS in places where the user
     expects to see a shadow. This means that mutter will hardcode the
     extents to 0 when the window is maximized. If the window is tiled-left,
     then all extents will be 0, except for the shadow on the right hand
     side, and vice versa for the tiled-right state.
This commit is contained in:
Jasper St. Pierre 2014-01-10 13:25:54 -05:00
parent 911cca9c99
commit 7e28a69c51
1 changed files with 42 additions and 18 deletions
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56
src/core/window.c
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@ -5727,6 +5727,32 @@ meta_window_get_input_rect (const MetaWindow *window,
*rect = window->rect;
}
static void
get_custom_frame_extents (MetaWindow *window,
GtkBorder *extents)
{
if (!window->has_custom_frame_extents)
return;
*extents = window->custom_frame_extents;
if (META_WINDOW_MAXIMIZED_HORIZONTALLY (window))
{
extents->left = 0;
extents->right = 0;
}
else if (META_WINDOW_TILED_LEFT (window))
extents->left = 0;
else if (META_WINDOW_TILED_RIGHT (window))
extents->right = 0;
if (META_WINDOW_MAXIMIZED_VERTICALLY (window))
{
extents->top = 0;
extents->bottom = 0;
}
}
/**
* meta_window_client_rect_to_frame_rect:
* @window: a #MetaWindow
@ -5765,16 +5791,15 @@ meta_window_client_rect_to_frame_rect (MetaWindow *window,
}
else
{
if (window->has_custom_frame_extents)
{
const GtkBorder *extents = &window->custom_frame_extents;
frame_rect->x += extents->left;
frame_rect->y += extents->top;
GtkBorder extents = { 0 };
get_custom_frame_extents (window, &extents);
frame_rect->x += extents.left;
frame_rect->y += extents.top;
if (frame_rect->width != G_MAXINT)
frame_rect->width -= extents->left + extents->right;
frame_rect->width -= extents.left + extents.right;
if (frame_rect->height != G_MAXINT)
frame_rect->height -= extents->top + extents->bottom;
}
frame_rect->height -= extents.top + extents.bottom;
}
}
@ -5809,14 +5834,13 @@ meta_window_frame_rect_to_client_rect (MetaWindow *window,
}
else
{
if (window->has_custom_frame_extents)
{
const GtkBorder *extents = &window->custom_frame_extents;
client_rect->x -= extents->left;
client_rect->y -= extents->top;
client_rect->width += extents->left + extents->right;
client_rect->height += extents->top + extents->bottom;
}
GtkBorder extents = { 0 };
get_custom_frame_extents (window, &extents);
client_rect->x -= extents.left;
client_rect->y -= extents.top;
client_rect->width += extents.left + extents.right;
client_rect->height += extents.top + extents.bottom;
}
}