[gtk+/wip/attach-params: 1/20] gdkattachparams: add GdkAttachParams



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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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.
+ *
+ * ![](attach-anchors.png)
+ *
+ * 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.
+ *
+ * ![](attach-flip-x.png)
+ *
+ * ![](attach-flip-y.png)
+ *
+ * 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.
+ *
+ * ![](attach-margin.png)
+ *
+ * ![](attach-padding.png)
+ *
+ * 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 (&params->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 (&params->attach_parent, parent);
+    }
+  else
+    {
+      params->has_attach_rect = FALSE;
+      g_clear_object (&params->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.
+ *
+ * ![](attach-anchors.png)
+ *
+ * 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.
+ *
+ * ![](attach-anchors.png)
+ *
+ * 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.
+ *
+ * ![](attach-flip-x.png)
+ *
+ * ![](attach-flip-y.png)
+ *
+ * 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.
+ *
+ * ![](attach-margin.png)
+ *
+ * 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.
+ *
+ * ![](attach-padding.png)
+ *
+ * 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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