[gtk+/wip/attach-params: 1/20] gdkattachparams: add GdkAttachParams
- From: William Hua <williamhua src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gtk+/wip/attach-params: 1/20] gdkattachparams: add GdkAttachParams
- Date: Tue, 26 Jan 2016 17:19:42 +0000 (UTC)
commit b366734e72e17ff54d9ec78304f0e5eea514ba2a
Author: William Hua <william hua canonical com>
Date: Wed Jan 20 02:20:20 2016 -0600
gdkattachparams: add GdkAttachParams
https://bugzilla.gnome.org/show_bug.cgi?id=756579
docs/reference/gdk/Makefile.am | 5 +
docs/reference/gdk/gdk-docs.sgml | 1 +
docs/reference/gdk/gdk3-sections.txt | 23 +
docs/reference/gdk/images/attach-anchors.png | Bin 0 -> 20500 bytes
docs/reference/gdk/images/attach-flip-x.png | Bin 0 -> 8718 bytes
docs/reference/gdk/images/attach-flip-y.png | Bin 0 -> 8409 bytes
docs/reference/gdk/images/attach-margin.png | Bin 0 -> 6493 bytes
docs/reference/gdk/images/attach-padding.png | Bin 0 -> 7018 bytes
docs/reference/gdk/images/gdkattachparams.svg | 1060 +++++++++++++++++++++++++
gdk/Makefile.am | 3 +
gdk/gdk.h | 1 +
gdk/gdkattachparams.c | 844 ++++++++++++++++++++
gdk/gdkattachparams.h | 98 +++
gdk/gdkattachparamsprivate.h | 77 ++
14 files changed, 2112 insertions(+), 0 deletions(-)
---
diff --git a/docs/reference/gdk/Makefile.am b/docs/reference/gdk/Makefile.am
index aef7cab..acd5eaf 100644
--- a/docs/reference/gdk/Makefile.am
+++ b/docs/reference/gdk/Makefile.am
@@ -60,6 +60,11 @@ HTML_IMAGES = \
images/rotated-text.png \
images/X_cursor.png \
images/arrow.png \
+ images/attach-anchors.png \
+ images/attach-flip-x.png \
+ images/attach-flip-y.png \
+ images/attach-margin.png \
+ images/attach-padding.png \
images/based_arrow_down.png \
images/based_arrow_up.png \
images/boat.png \
diff --git a/docs/reference/gdk/gdk-docs.sgml b/docs/reference/gdk/gdk-docs.sgml
index fdd36a4..6962b4d 100644
--- a/docs/reference/gdk/gdk-docs.sgml
+++ b/docs/reference/gdk/gdk-docs.sgml
@@ -47,6 +47,7 @@
<xi:include href="xml/wayland_interaction.xml" />
<xi:include href="xml/gdkapplaunchcontext.xml" />
<xi:include href="xml/gdktestutils.xml" />
+ <xi:include href="xml/gdkattachparams.xml" />
</reference>
<reference>
diff --git a/docs/reference/gdk/gdk3-sections.txt b/docs/reference/gdk/gdk3-sections.txt
index cfcce26..a0ac710 100644
--- a/docs/reference/gdk/gdk3-sections.txt
+++ b/docs/reference/gdk/gdk3-sections.txt
@@ -551,6 +551,29 @@ gdk_fullscreen_mode_get_type
</SECTION>
<SECTION>
+<TITLE>Attachment Parameters</TITLE>
+<FILE>gdkattachparams</FILE>
+GdkAttachParams
+GdkAttachCallback
+gdk_attach_params_new
+gdk_attach_params_free
+gdk_attach_params_set_attach_rect
+gdk_attach_params_set_anchors
+gdk_attach_params_get_anchors
+gdk_attach_params_set_flip_flags
+gdk_attach_params_set_attach_margin
+gdk_attach_params_set_window_padding
+gdk_attach_params_set_window_offset
+gdk_attach_params_set_position_callback
+
+<SUBSECTION Private>
+_GdkAttachParams
+gdk_attach_params_choose_position
+gdk_attach_params_choose_position_for_window
+gdk_attach_params_move_window
+</SECTION>
+
+<SECTION>
<TITLE>Selections</TITLE>
<FILE>selections</FILE>
GDK_SELECTION_PRIMARY
diff --git a/docs/reference/gdk/images/attach-anchors.png b/docs/reference/gdk/images/attach-anchors.png
new file mode 100644
index 0000000..f2f71cb
Binary files /dev/null and b/docs/reference/gdk/images/attach-anchors.png differ
diff --git a/docs/reference/gdk/images/attach-flip-x.png b/docs/reference/gdk/images/attach-flip-x.png
new file mode 100644
index 0000000..6f73953
Binary files /dev/null and b/docs/reference/gdk/images/attach-flip-x.png differ
diff --git a/docs/reference/gdk/images/attach-flip-y.png b/docs/reference/gdk/images/attach-flip-y.png
new file mode 100644
index 0000000..32cb7b2
Binary files /dev/null and b/docs/reference/gdk/images/attach-flip-y.png differ
diff --git a/docs/reference/gdk/images/attach-margin.png b/docs/reference/gdk/images/attach-margin.png
new file mode 100644
index 0000000..9713dc5
Binary files /dev/null and b/docs/reference/gdk/images/attach-margin.png differ
diff --git a/docs/reference/gdk/images/attach-padding.png b/docs/reference/gdk/images/attach-padding.png
new file mode 100644
index 0000000..cf41c51
Binary files /dev/null and b/docs/reference/gdk/images/attach-padding.png differ
diff --git a/docs/reference/gdk/images/gdkattachparams.svg b/docs/reference/gdk/images/gdkattachparams.svg
new file mode 100644
index 0000000..5e27379
--- /dev/null
+++ b/docs/reference/gdk/images/gdkattachparams.svg
@@ -0,0 +1,1060 @@
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+ sodipodi:role="line"
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+ <text
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+ <g
+ id="g9819"
+ transform="translate(-7.98535,-9)">
+ <text
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+</svg>
diff --git a/gdk/Makefile.am b/gdk/Makefile.am
index 84942ce..4314865 100644
--- a/gdk/Makefile.am
+++ b/gdk/Makefile.am
@@ -63,6 +63,7 @@ gdk_public_h_sources = \
gdk.h \
gdk-autocleanup.h \
gdkapplaunchcontext.h \
+ gdkattachparams.h \
gdkcairo.h \
gdkcursor.h \
gdkdevice.h \
@@ -103,6 +104,7 @@ gdk_h_sources = \
gdk_private_headers = \
gdk-private.h \
gdkapplaunchcontextprivate.h \
+ gdkattachparamsprivate.h \
gdkcursorprivate.h \
gdkdevicemanagerprivate.h \
gdkdeviceprivate.h \
@@ -129,6 +131,7 @@ gdk_c_sources = \
gdk-private.c \
gdk.c \
gdkapplaunchcontext.c \
+ gdkattachparams.c \
gdkcairo.c \
gdkcursor.c \
gdkdeprecated.c \
diff --git a/gdk/gdk.h b/gdk/gdk.h
index 81ba765..869f6bf 100644
--- a/gdk/gdk.h
+++ b/gdk/gdk.h
@@ -30,6 +30,7 @@
#include <gdk/gdkconfig.h>
#include <gdk/gdkversionmacros.h>
#include <gdk/gdkapplaunchcontext.h>
+#include <gdk/gdkattachparams.h>
#include <gdk/gdkcairo.h>
#include <gdk/gdkcursor.h>
#include <gdk/gdkdevice.h>
diff --git a/gdk/gdkattachparams.c b/gdk/gdkattachparams.c
new file mode 100644
index 0000000..3bf89ee
--- /dev/null
+++ b/gdk/gdkattachparams.c
@@ -0,0 +1,844 @@
+#include "config.h"
+
+#include "gdkattachparamsprivate.h"
+#include "gdkscreen.h"
+#include "gdkwindow.h"
+
+/**
+ * SECTION: gdkattachparams
+ * @section_id: GdkAttachParams
+ * @title: Attachment Parameters
+ * @short_description: Describing relative window position
+ * @stability: Unstable
+ * @include: gdk/gdkattachparams.h
+ *
+ * A full description of how a window should be positioned relative to an
+ * attachment rectangle.
+ *
+ * Certain widgets such as menus and combo boxes don't require explicit
+ * absolute positioning; they only need to be aligned with respect to another
+ * anchoring widget, such as a menu item, in such a way to not overflow
+ * off-screen. GTK+ cannot always determine such an optimal position since it
+ * requires knowledge of the geometry of the monitor workarea as well as the
+ * ability to position windows in absolute root window coordinates, which some
+ * GDK backends do not support.
+ *
+ * A minimal #GdkAttachParams description should have an attachment rectangle,
+ * an attachment rectangle anchor, and a window anchor. The attachment
+ * rectangle is the allocation of the anchoring widget, which can be a menu
+ * item, menu button, combo box, etc. It can even be a 1x1 pixel at
+ * the current cursor position. The attachment rectangle anchor is a
+ * #GdkWindowEdge describing a point on the attachment rectangle that the
+ * window should be anchored to. The window anchor is the point on the window
+ * that should anchor onto the attachment rectangle's anchor.
+ *
+ * 
+ *
+ * In addition, you can also specify additional "flip" parameters that hint to
+ * the backend that the anchors can be mirrored if not enough space is
+ * available horizontally or vertically on-screen.
+ *
+ * 
+ *
+ * 
+ *
+ * There are also additional parameters that can be set to fine tune the
+ * positioning of the window, such as margin and padding, as well as a
+ * callback to obtain the final position of the window.
+ *
+ * 
+ *
+ * 
+ *
+ * Since: 3.20
+ */
+
+/**
+ * gdk_attach_params_new:
+ *
+ * Creates a new #GdkAttachParams for describing the position of a window
+ * relative to an attachment rectangle.
+ *
+ * Returns: (transfer full): a new #GdkAttachParams, to be freed with
+ * gdk_attach_params_free()
+ *
+ * Since: 3.20
+ */
+GdkAttachParams *
+gdk_attach_params_new (void)
+{
+ GdkAttachParams *params = g_new0 (GdkAttachParams, 1);
+
+ params->attach_anchor = GDK_WINDOW_EDGE_CENTER;
+ params->window_anchor = GDK_WINDOW_EDGE_CENTER;
+ params->flip_x = TRUE;
+ params->flip_y = TRUE;
+
+ return params;
+}
+
+/**
+ * gdk_attach_params_free:
+ * @data: the #GdkAttachParams to free
+ *
+ * Releases @data.
+ *
+ * Since: 3.20
+ */
+void
+gdk_attach_params_free (gpointer data)
+{
+ GdkAttachParams *params;
+
+ g_return_if_fail (data);
+
+ params = data;
+
+ if (params->attach_user_data && params->attach_destroy_notify)
+ params->attach_destroy_notify (params->attach_user_data);
+
+ g_clear_object (¶ms->attach_parent);
+
+ g_free (params);
+}
+
+/**
+ * gdk_attach_params_set_attach_rect:
+ * @params: a #GdkAttachParams
+ * @rectangle: (nullable): the attachment rectangle
+ * @parent: (nullable): the #GdkWindow that @rectangle is relative to
+ *
+ * Sets the attachment rectangle the window needs to be aligned relative to.
+ *
+ * Since: 3.20
+ */
+void
+gdk_attach_params_set_attach_rect (GdkAttachParams *params,
+ const GdkRectangle *rectangle,
+ GdkWindow *parent)
+{
+ g_return_if_fail (params);
+
+ if (rectangle)
+ {
+ params->has_attach_rect = TRUE;
+ params->attach_rect = *rectangle;
+ g_set_object (¶ms->attach_parent, parent);
+ }
+ else
+ {
+ params->has_attach_rect = FALSE;
+ g_clear_object (¶ms->attach_parent);
+ }
+}
+
+/**
+ * gdk_attach_params_set_anchors:
+ * @params: a #GdkAttachParams
+ * @attach_anchor: the anchor on the attachment rectangle
+ * @window_anchor: the anchor on the window
+ *
+ * Sets how the attachment rectangle and window should be anchored to each
+ * other.
+ *
+ * 
+ *
+ * Since: 3.20
+ */
+void
+gdk_attach_params_set_anchors (GdkAttachParams *params,
+ GdkWindowEdge attach_anchor,
+ GdkWindowEdge window_anchor)
+{
+ g_return_if_fail (params);
+
+ params->attach_anchor = attach_anchor;
+ params->window_anchor = window_anchor;
+}
+
+/**
+ * gdk_attach_params_get_anchors:
+ * @params: a #GdkAttachParams
+ * @attach_anchor: (out) (optional): the anchor on the attachment rectangle
+ * @window_anchor: (out) (optional): the anchor on the window
+ *
+ * Gets how the attachment rectangle and window should be anchored to each
+ * other.
+ *
+ * 
+ *
+ * Since: 3.20
+ */
+void
+gdk_attach_params_get_anchors (const GdkAttachParams *params,
+ GdkWindowEdge *attach_anchor,
+ GdkWindowEdge *window_anchor)
+{
+ g_return_if_fail (params);
+
+ if (attach_anchor)
+ *attach_anchor = params->attach_anchor;
+
+ if (window_anchor)
+ *window_anchor = params->window_anchor;
+}
+
+/**
+ * gdk_attach_params_set_flip_flags:
+ * @params: a #GdkAttachParams
+ * @flip_x: %TRUE if the backend should try flipping the anchors horizontally
+ * when not enough space is available
+ * @flip_y: %TRUE if the backend should try flipping the anchors vertically
+ * when not enough space is available
+ *
+ * Sets hints to the backend to try flipping the anchors when not enough space
+ * is available.
+ *
+ * 
+ *
+ * 
+ *
+ * Since: 3.20
+ */
+void
+gdk_attach_params_set_flip_flags (GdkAttachParams *params,
+ gboolean flip_x,
+ gboolean flip_y)
+{
+ g_return_if_fail (params);
+
+ params->flip_x = flip_x;
+ params->flip_y = flip_y;
+}
+
+/**
+ * gdk_attach_params_set_attach_margin:
+ * @params: a #GdkAttachParams
+ * @margin: (nullable): the space around the attachment rectangle
+ *
+ * Sets the amount of space to leave around the attachment rectangle.
+ *
+ * 
+ *
+ * Since: 3.20
+ */
+void
+gdk_attach_params_set_attach_margin (GdkAttachParams *params,
+ const GdkBorder *margin)
+{
+ GdkBorder zero = { 0 };
+
+ g_return_if_fail (params);
+
+ params->attach_margin = margin ? *margin : zero;
+}
+
+/**
+ * gdk_attach_params_set_window_padding:
+ * @params: a #GdkAttachParams
+ * @padding: (nullable): the space between the window and its
+ * contents.
+ *
+ * Sets the amount of space between the window and its contents.
+ *
+ * 
+ *
+ * Since: 3.20
+ */
+void
+gdk_attach_params_set_window_padding (GdkAttachParams *params,
+ const GdkBorder *padding)
+{
+ GdkBorder zero = { 0 };
+
+ g_return_if_fail (params);
+
+ params->window_padding = padding ? *padding : zero;
+}
+
+/**
+ * gdk_attach_params_set_window_offset:
+ * @params: a #GdkAttachParams
+ * @x: horizontal displacement
+ * @y: vertical displacement
+ *
+ * Sets the offset to displace the window by.
+ *
+ * Since: 3.20
+ */
+void
+gdk_attach_params_set_window_offset (GdkAttachParams *params,
+ gint x,
+ gint y)
+{
+ g_return_if_fail (params);
+
+ params->offset_x = x;
+ params->offset_y = y;
+}
+
+/**
+ * gdk_attach_params_set_position_callback:
+ * @params: a #GdkAttachParams
+ * @callback: (nullable): a function to be called when the final position of
+ * the window is known
+ * @user_data: (transfer full) (nullable): additional data to pass to @callback
+ * @destroy_notify: (nullable): a function to release @user_data
+ *
+ * Sets the function to be called when the final position of the window is
+ * known.
+ *
+ * Since: 3.20
+ */
+void
+gdk_attach_params_set_position_callback (GdkAttachParams *params,
+ GdkAttachCallback callback,
+ gpointer user_data,
+ GDestroyNotify destroy_notify)
+{
+ g_return_if_fail (params);
+
+ params->attach_callback = callback;
+
+ if (user_data != params->attach_user_data)
+ {
+ if (params->attach_user_data && params->attach_destroy_notify)
+ params->attach_destroy_notify (params->attach_user_data);
+
+ params->attach_user_data = user_data;
+ params->attach_destroy_notify = destroy_notify;
+ }
+ else if (user_data)
+ g_warning ("%s (): params already owns user data", G_STRFUNC);
+}
+
+static gint
+get_edge_x (GdkWindowEdge edge)
+{
+ switch (edge)
+ {
+ case GDK_WINDOW_EDGE_NORTH_WEST:
+ case GDK_WINDOW_EDGE_WEST:
+ case GDK_WINDOW_EDGE_SOUTH_WEST:
+ return -1;
+
+ case GDK_WINDOW_EDGE_NORTH:
+ case GDK_WINDOW_EDGE_CENTER:
+ case GDK_WINDOW_EDGE_SOUTH:
+ return 0;
+
+ case GDK_WINDOW_EDGE_NORTH_EAST:
+ case GDK_WINDOW_EDGE_EAST:
+ case GDK_WINDOW_EDGE_SOUTH_EAST:
+ return 1;
+ }
+
+ g_return_val_if_reached (0);
+}
+
+static gint
+get_edge_y (GdkWindowEdge edge)
+{
+ switch (edge)
+ {
+ case GDK_WINDOW_EDGE_NORTH_WEST:
+ case GDK_WINDOW_EDGE_NORTH:
+ case GDK_WINDOW_EDGE_NORTH_EAST:
+ return -1;
+
+ case GDK_WINDOW_EDGE_WEST:
+ case GDK_WINDOW_EDGE_CENTER:
+ case GDK_WINDOW_EDGE_EAST:
+ return 0;
+
+ case GDK_WINDOW_EDGE_SOUTH_WEST:
+ case GDK_WINDOW_EDGE_SOUTH:
+ case GDK_WINDOW_EDGE_SOUTH_EAST:
+ return 1;
+ }
+
+ g_return_val_if_reached (0);
+}
+
+static GdkWindowEdge
+get_opposite_edge (GdkWindowEdge edge)
+{
+ switch (edge)
+ {
+ case GDK_WINDOW_EDGE_NORTH_WEST:
+ return GDK_WINDOW_EDGE_SOUTH_EAST;
+
+ case GDK_WINDOW_EDGE_NORTH:
+ return GDK_WINDOW_EDGE_SOUTH;
+
+ case GDK_WINDOW_EDGE_NORTH_EAST:
+ return GDK_WINDOW_EDGE_SOUTH_WEST;
+
+ case GDK_WINDOW_EDGE_WEST:
+ return GDK_WINDOW_EDGE_EAST;
+
+ case GDK_WINDOW_EDGE_CENTER:
+ return GDK_WINDOW_EDGE_CENTER;
+
+ case GDK_WINDOW_EDGE_EAST:
+ return GDK_WINDOW_EDGE_WEST;
+
+ case GDK_WINDOW_EDGE_SOUTH_WEST:
+ return GDK_WINDOW_EDGE_NORTH_EAST;
+
+ case GDK_WINDOW_EDGE_SOUTH:
+ return GDK_WINDOW_EDGE_NORTH;
+
+ case GDK_WINDOW_EDGE_SOUTH_EAST:
+ return GDK_WINDOW_EDGE_NORTH_WEST;
+ }
+
+ g_return_val_if_reached (edge);
+}
+
+static void
+get_margin_usage (GdkWindowEdge attach_anchor,
+ GdkWindowEdge window_anchor,
+ gint *margin_x,
+ gint *margin_y)
+{
+ gint attach_x;
+ gint attach_y;
+ gint window_x;
+ gint window_y;
+
+ if (margin_x)
+ {
+ attach_x = get_edge_x (attach_anchor);
+ window_x = get_edge_x (window_anchor);
+ *margin_x = attach_x * (attach_x == -window_x);
+ }
+
+ if (margin_y)
+ {
+ attach_y = get_edge_y (attach_anchor);
+ window_y = get_edge_y (window_anchor);
+ *margin_y = attach_y * (attach_y == -window_y);
+ }
+}
+
+static void
+get_anchor_point (gint x,
+ gint y,
+ gint width,
+ gint height,
+ GdkWindowEdge edge,
+ gint *out_x,
+ gint *out_y)
+{
+ if (out_x)
+ {
+ switch (get_edge_x (edge))
+ {
+ case -1:
+ *out_x = x;
+ break;
+
+ case 0:
+ *out_x = x + width / 2;
+ break;
+
+ case 1:
+ *out_x = x + width;
+ break;
+ }
+ }
+
+ if (out_y)
+ {
+ switch (get_edge_y (edge))
+ {
+ case -1:
+ *out_y = y;
+ break;
+
+ case 0:
+ *out_y = y + height / 2;
+ break;
+
+ case 1:
+ *out_y = y + height;
+ break;
+ }
+ }
+}
+
+static gint
+clamp_with_feedback (gint val,
+ gint min,
+ gint max,
+ gint *offset)
+{
+ if (val < min && val > max)
+ {
+ if (min - val <= val - max)
+ {
+ *offset = min - val;
+ return min;
+ }
+ else
+ {
+ *offset = max - val;
+ return max;
+ }
+ }
+ else if (val < min)
+ {
+ *offset = min - val;
+ return min;
+ }
+ else if (val > max)
+ {
+ *offset = max - val;
+ return max;
+ }
+ else
+ {
+ *offset = 0;
+ return val;
+ }
+}
+
+/**
+ * gdk_attach_params_choose_position:
+ * @params: a #GdkAttachParams
+ * @width: window width
+ * @height: window height
+ * @bounds: (nullable): monitor geometry
+ * @x: (out) (optional): the best x-coordinate for the window
+ * @y: (out) (optional): the best y-coordinate for the window
+ * @offset_x: (out) (optional): the horizontal displacement needed to push the
+ * window on-screen
+ * @offset_y: (out) (optional): the vertical displacement needed to push the
+ * window on-screen
+ * @flipped_x: (out) (optional): %TRUE if the window was flipped horizontally
+ * @flipped_y: (out) (optional): %TRUE if the window was flipped vertically
+ *
+ * Finds the best position for a window of size @width and @height on a screen
+ * with @bounds using the given @params.
+ *
+ * Since: 3.20
+ */
+void
+gdk_attach_params_choose_position (const GdkAttachParams *params,
+ gint width,
+ gint height,
+ const GdkRectangle *bounds,
+ gint *x,
+ gint *y,
+ gint *offset_x,
+ gint *offset_y,
+ gboolean *flipped_x,
+ gboolean *flipped_y)
+{
+ gint tmp_x;
+ gint tmp_y;
+ gint tmp_offset_x;
+ gint tmp_offset_y;
+ gboolean tmp_flipped_x;
+ gboolean tmp_flipped_y;
+ GdkRectangle padded_bounds;
+ gint rect_x;
+ gint rect_y;
+ gint first_x;
+ gint first_y;
+ gint second_x;
+ gint second_y;
+ gint margin_x;
+ gint margin_y;
+
+ g_return_if_fail (params);
+ g_return_if_fail (params->has_attach_rect);
+
+ if (!x)
+ x = &tmp_x;
+
+ if (!y)
+ y = &tmp_y;
+
+ if (!offset_x)
+ offset_x = &tmp_offset_x;
+
+ if (!offset_y)
+ offset_y = &tmp_offset_y;
+
+ if (!flipped_x)
+ flipped_x = &tmp_flipped_x;
+
+ if (!flipped_y)
+ flipped_y = &tmp_flipped_y;
+
+ *offset_x = 0;
+ *offset_y = 0;
+ *flipped_x = FALSE;
+ *flipped_y = FALSE;
+
+ if (params->attach_parent)
+ gdk_window_get_origin (params->attach_parent, &rect_x, &rect_y);
+ else
+ {
+ rect_x = 0;
+ rect_y = 0;
+ }
+
+ rect_x += params->attach_rect.x;
+ rect_y += params->attach_rect.y;
+
+ get_anchor_point (rect_x,
+ rect_y,
+ params->attach_rect.width,
+ params->attach_rect.height,
+ params->attach_anchor,
+ &first_x,
+ &first_y);
+
+ get_anchor_point (first_x - params->window_padding.left,
+ first_y - params->window_padding.top,
+ -(width - params->window_padding.left - params->window_padding.right),
+ -(height - params->window_padding.top - params->window_padding.bottom),
+ params->window_anchor,
+ &first_x,
+ &first_y);
+
+ get_margin_usage (params->attach_anchor, params->window_anchor, &margin_x, &margin_y);
+
+ switch (margin_x)
+ {
+ case -1:
+ first_x -= params->attach_margin.left;
+ break;
+
+ case 1:
+ first_x += params->attach_margin.right;
+ break;
+ }
+
+ switch (margin_y)
+ {
+ case -1:
+ first_y -= params->attach_margin.top;
+ break;
+
+ case 1:
+ first_y += params->attach_margin.bottom;
+ break;
+ }
+
+ first_x += params->offset_x;
+ first_y += params->offset_y;
+
+ if (bounds)
+ {
+ padded_bounds = *bounds;
+ padded_bounds.x -= params->window_padding.left;
+ padded_bounds.y -= params->window_padding.top;
+ padded_bounds.width += params->window_padding.left + params->window_padding.right;
+ padded_bounds.height += params->window_padding.top + params->window_padding.bottom;
+ }
+
+ if (bounds && (first_x < padded_bounds.x || first_x + width > padded_bounds.x + padded_bounds.width) &&
params->flip_x)
+ {
+ get_anchor_point (rect_x,
+ 0,
+ params->attach_rect.width,
+ 0,
+ get_opposite_edge (params->attach_anchor),
+ &second_x,
+ NULL);
+
+ get_anchor_point (second_x - params->window_padding.left,
+ 0,
+ -(width - params->window_padding.left - params->window_padding.right),
+ 0,
+ get_opposite_edge (params->window_anchor),
+ &second_x,
+ NULL);
+
+ switch (margin_x)
+ {
+ case -1:
+ second_x += params->attach_margin.right;
+ break;
+
+ case 1:
+ second_x -= params->attach_margin.left;
+ break;
+ }
+
+ second_x -= params->offset_x;
+
+ if (second_x >= padded_bounds.x && second_x + width <= padded_bounds.x + padded_bounds.width)
+ {
+ *x = second_x;
+ *flipped_x = TRUE;
+ }
+ else
+ *x = first_x;
+ }
+ else
+ *x = first_x;
+
+ if (bounds && (first_y < padded_bounds.y || first_y + height > padded_bounds.y + padded_bounds.height) &&
params->flip_y)
+ {
+ get_anchor_point (0,
+ rect_y,
+ 0,
+ params->attach_rect.height,
+ get_opposite_edge (params->attach_anchor),
+ NULL,
+ &second_y);
+
+ get_anchor_point (0,
+ second_y - params->window_padding.top,
+ 0,
+ -(height - params->window_padding.top - params->window_padding.bottom),
+ get_opposite_edge (params->window_anchor),
+ NULL,
+ &second_y);
+
+ switch (margin_y)
+ {
+ case -1:
+ second_y += params->attach_margin.bottom;
+ break;
+
+ case 1:
+ second_y -= params->attach_margin.top;
+ break;
+ }
+
+ second_y -= params->offset_y;
+
+ if (second_y >= padded_bounds.y && second_y + height <= padded_bounds.y + padded_bounds.height)
+ {
+ *y = second_y;
+ *flipped_y = TRUE;
+ }
+ else
+ *y = first_y;
+ }
+ else
+ *y = first_y;
+
+ if (bounds)
+ {
+ *x = clamp_with_feedback (*x, padded_bounds.x, padded_bounds.x + padded_bounds.width - width,
offset_x);
+ *y = clamp_with_feedback (*y, padded_bounds.y, padded_bounds.y + padded_bounds.height - height,
offset_y);
+ }
+}
+
+/**
+ * gdk_attach_params_choose_position_for_window:
+ * @params: a #GdkAttachParams
+ * @window: (transfer none) (not nullable): the #GdkWindow to find the best
+ * position for
+ * @x: (out) (optional): the best x-coordinate for the window
+ * @y: (out) (optional): the best y-coordinate for the window
+ * @offset_x: (out) (optional): the horizontal displacement needed to push the
+ * window on-screen
+ * @offset_y: (out) (optional): the vertical displacement needed to push the
+ * window on-screen
+ * @flipped_x: (out) (optional): %TRUE if the window was flipped horizontally
+ * @flipped_y: (out) (optional): %TRUE if the window was flipped vertically
+ *
+ * Finds the best position for @window according to @params.
+ *
+ * Since: 3.20
+ */
+void
+gdk_attach_params_choose_position_for_window (const GdkAttachParams *params,
+ GdkWindow *window,
+ gint *x,
+ gint *y,
+ gint *offset_x,
+ gint *offset_y,
+ gboolean *flipped_x,
+ gboolean *flipped_y)
+{
+ GdkScreen *screen;
+ gint origin_x;
+ gint origin_y;
+ gint center_x;
+ gint center_y;
+ gint monitor;
+ GdkRectangle bounds;
+ gint width;
+ gint height;
+
+ g_return_if_fail (params);
+ g_return_if_fail (params->has_attach_rect);
+ g_return_if_fail (window);
+
+ screen = gdk_window_get_screen (window);
+ gdk_window_get_origin (window, &origin_x, &origin_y);
+ center_x = origin_x + params->attach_rect.x + params->attach_rect.width / 2;
+ center_y = origin_y + params->attach_rect.y + params->attach_rect.height / 2;
+ monitor = gdk_screen_get_monitor_at_point (screen, center_x, center_y);
+ gdk_screen_get_monitor_workarea (screen, monitor, &bounds);
+ width = gdk_window_get_width (window);
+ height = gdk_window_get_height (window);
+
+ return gdk_attach_params_choose_position (params,
+ width,
+ height,
+ &bounds,
+ x,
+ y,
+ offset_x,
+ offset_y,
+ flipped_x,
+ flipped_y);
+}
+
+/**
+ * gdk_attach_params_move_window:
+ * @params: a #GdkAttachParams
+ * @window: (transfer none) (not nullable): the #GdkWindow to position
+ *
+ * Moves @window to the best position according to @params.
+ *
+ * Since: 3.20
+ */
+void
+gdk_attach_params_move_window (const GdkAttachParams *params,
+ GdkWindow *window)
+{
+ gint x;
+ gint y;
+ gint offset_x;
+ gint offset_y;
+ gboolean flipped_x;
+ gboolean flipped_y;
+
+ g_return_if_fail (GDK_IS_WINDOW (window));
+
+ if (!params || !params->has_attach_rect)
+ return;
+
+ gdk_attach_params_choose_position_for_window (params,
+ window,
+ &x,
+ &y,
+ &offset_x,
+ &offset_y,
+ &flipped_x,
+ &flipped_y);
+
+ gdk_window_move (window, x, y);
+
+ if (params->attach_callback)
+ params->attach_callback (window,
+ params,
+ x,
+ y,
+ offset_x,
+ offset_y,
+ flipped_x,
+ flipped_y,
+ params->attach_user_data);
+}
diff --git a/gdk/gdkattachparams.h b/gdk/gdkattachparams.h
new file mode 100644
index 0000000..5ff527d
--- /dev/null
+++ b/gdk/gdkattachparams.h
@@ -0,0 +1,98 @@
+#ifndef __GDK_ATTACH_PARAMS_H__
+#define __GDK_ATTACH_PARAMS_H__
+
+#if !defined (__GDK_H_INSIDE__) && !defined (GDK_COMPILATION)
+#error "Only <gdk/gdk.h> can be included directly."
+#endif
+
+#include <gdk/gdktypes.h>
+#include <gdk/gdkversionmacros.h>
+
+G_BEGIN_DECLS
+
+/**
+ * GdkAttachParams:
+ *
+ * Opaque type containing the information needed to position a window relative
+ * to an attachment rectangle.
+ *
+ * Since: 3.20
+ */
+typedef struct _GdkAttachParams GdkAttachParams;
+
+/**
+ * GdkAttachCallback:
+ * @window: the #GdkWindow that was moved
+ * @params: (transfer none) (nullable): the #GdkAttachParams that was used
+ * @x: the final x-coordinate of @window
+ * @y: the final y-coordinate of @window
+ * @offset_x: the horizontal displacement applied to keep @window on-screen
+ * @offset_y: the vertical displacement applied to keep @window on-screen
+ * @flipped_x: %TRUE if the backend flipped @window horizontally
+ * @flipped_y: %TRUE if the backend flipped @window vertically
+ * @user_data: (transfer none) (nullable): the user data that was set on
+ * @params
+ *
+ * A function that can be used to receive information about the final position
+ * of a window.
+ *
+ * Since: 3.20
+ */
+typedef void (*GdkAttachCallback) (GdkWindow *window,
+ const GdkAttachParams *params,
+ gint x,
+ gint y,
+ gint offset_x,
+ gint offset_y,
+ gboolean flipped_x,
+ gboolean flipped_y,
+ gpointer user_data);
+
+GDK_AVAILABLE_IN_3_20
+GdkAttachParams * gdk_attach_params_new (void);
+
+GDK_AVAILABLE_IN_3_20
+void gdk_attach_params_free (gpointer data);
+
+GDK_AVAILABLE_IN_3_20
+void gdk_attach_params_set_attach_rect (GdkAttachParams *params,
+ const GdkRectangle *rectangle,
+ GdkWindow *parent);
+
+GDK_AVAILABLE_IN_3_20
+void gdk_attach_params_set_anchors (GdkAttachParams *params,
+ GdkWindowEdge attach_anchor,
+ GdkWindowEdge window_anchor);
+
+GDK_AVAILABLE_IN_3_20
+void gdk_attach_params_get_anchors (const GdkAttachParams *params,
+ GdkWindowEdge *attach_anchor,
+ GdkWindowEdge *window_anchor);
+
+GDK_AVAILABLE_IN_3_20
+void gdk_attach_params_set_flip_flags (GdkAttachParams *params,
+ gboolean flip_x,
+ gboolean flip_y);
+
+GDK_AVAILABLE_IN_3_20
+void gdk_attach_params_set_attach_margin (GdkAttachParams *params,
+ const GdkBorder *margin);
+
+GDK_AVAILABLE_IN_3_20
+void gdk_attach_params_set_window_padding (GdkAttachParams *params,
+ const GdkBorder *padding);
+
+GDK_AVAILABLE_IN_3_20
+void gdk_attach_params_set_window_offset (GdkAttachParams *params,
+ gint x,
+ gint y);
+
+GDK_AVAILABLE_IN_3_20
+void gdk_attach_params_set_position_callback (GdkAttachParams *params,
+ GdkAttachCallback callback,
+ gpointer user_data,
+ GDestroyNotify destroy_notify);
+
+G_END_DECLS
+
+#endif /* __GDK_ATTACH_PARAMS_H__ */
diff --git a/gdk/gdkattachparamsprivate.h b/gdk/gdkattachparamsprivate.h
new file mode 100644
index 0000000..a9c3e4a
--- /dev/null
+++ b/gdk/gdkattachparamsprivate.h
@@ -0,0 +1,77 @@
+#ifndef __GDK_ATTACH_PARAMS_PRIVATE_H__
+#define __GDK_ATTACH_PARAMS_PRIVATE_H__
+
+#include "gdkattachparams.h"
+
+G_BEGIN_DECLS
+
+/*
+ * GdkAttachParams:
+ * @has_attach_rect: %TRUE if @attach_rect is valid
+ * @attach_rect: the attachment rectangle to attach the window to
+ * @attach_parent: the #GdkWindow that @attach_rect is relative to
+ * @attach_anchor: the anchoring point on @attach_rect
+ * @window_anchor: the anchoring point on the window
+ * @flip_x: %TRUE if the backend can try flipping the window horizontally
+ * @flip_y: %TRUE if the backend can try flipping the window vertically
+ * @attach_margin: the space to leave around @attach_rect
+ * @window_padding: the space between the window and its contents
+ * @offset_x: the horizontal offset to displace the window by
+ * @offset_y: the vertical offset to displace the window by
+ * @attach_callback: a function to call when the final position is known
+ * @attach_user_data: additional data to pass to @attach_callback
+ * @attach_destroy_notify: a function to free @attach_user_data
+ *
+ * Opaque type containing the information needed to position a window relative
+ * to an attachment rectangle.
+ *
+ * Since: 3.20
+ */
+struct _GdkAttachParams
+{
+ /*< private >*/
+ gboolean has_attach_rect;
+ GdkRectangle attach_rect;
+ GdkWindow *attach_parent;
+
+ GdkWindowEdge attach_anchor;
+ GdkWindowEdge window_anchor;
+ gboolean flip_x;
+ gboolean flip_y;
+
+ GdkBorder attach_margin;
+ GdkBorder window_padding;
+ gint offset_x;
+ gint offset_y;
+
+ GdkAttachCallback attach_callback;
+ gpointer attach_user_data;
+ GDestroyNotify attach_destroy_notify;
+};
+
+void gdk_attach_params_choose_position (const GdkAttachParams *params,
+ gint width,
+ gint height,
+ const GdkRectangle *bounds,
+ gint *x,
+ gint *y,
+ gint *offset_x,
+ gint *offset_y,
+ gboolean *flipped_x,
+ gboolean *flipped_y);
+
+void gdk_attach_params_choose_position_for_window (const GdkAttachParams *params,
+ GdkWindow *window,
+ gint *x,
+ gint *y,
+ gint *offset_x,
+ gint *offset_y,
+ gboolean *flipped_x,
+ gboolean *flipped_y);
+
+void gdk_attach_params_move_window (const GdkAttachParams *params,
+ GdkWindow *window);
+
+G_END_DECLS
+
+#endif /* __GDK_ATTACH_PARAMS_PRIVATE_H__ */
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