Dont allow the user to 'resize a window out of the workarea'

BUG=151255
TEST=unit test & visual


Review URL: https://chromiumcodereview.appspot.com/11087037

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@162390 0039d316-1c4b-4281-b951-d872f2087c98

4 files changed, 133 insertions, 32 deletions

diff --git a/ash/wm/window_resizer.cc b/ash/wm/window_resizer.cc
index 6ea7552..bcb59a7 100644
--- a/ash/wm/window_resizer.cc
+++ b/ash/wm/window_resizer.cc
@@ -8,6 +8,7 @@
 #include "ash/shell.h"
 #include "ash/wm/property_util.h"
 #include "ash/wm/window_util.h"
+#include "ash/wm/workspace/workspace_layout_manager2.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
@@ -169,10 +170,14 @@ int WindowResizer::GetBoundsChangeForWindowComponent(int component) {
 // static
 gfx::Rect WindowResizer::CalculateBoundsForDrag(
     const Details& details,
-    const gfx::Point& location) {
+    const gfx::Point& passed_location) {
   if (!details.is_resizable)
     return details.initial_bounds;
 
+  gfx::Point location = passed_location;
+  gfx::Rect work_area =
+      ScreenAsh::GetDisplayWorkAreaBoundsInParent(details.window);
+
   int delta_x = location.x() - details.initial_location_in_parent.x();
   int delta_y = location.y() - details.initial_location_in_parent.y();
 
@@ -181,36 +186,67 @@ gfx::Rect WindowResizer::CalculateBoundsForDrag(
   // repositioning the window when the minimize size is reached.
   gfx::Size size = GetSizeForDrag(details, &delta_x, &delta_y);
   gfx::Point origin = GetOriginForDrag(details, delta_x, delta_y);
+  gfx::Rect new_bounds(origin, size);
 
-  // When we might want to reposition a window which is also restored to its
-  // previous size, to keep the cursor within the dragged window.
-  if (!details.restore_bounds.IsEmpty() &&
-      details.bounds_change & kBoundsChange_Repositions) {
-    // However - it is not desirable to change the origin if the window would
-    // be still hit by the cursor.
-    if (details.initial_location_in_parent.x() >
-            details.initial_bounds.x() + details.restore_bounds.width())
-      origin.set_x(location.x() - details.restore_bounds.width() / 2);
+  // Sizing has to keep the result on the screen. Note that this correction
+  // has to come first since it might have an impact on the origin as well as
+  // on the size.
+  if (details.bounds_change & kBoundsChange_Resizes) {
+    if (details.size_change_direction & kBoundsChangeDirection_Horizontal) {
+      if (IsRightEdge(details.window_component) &&
+          new_bounds.right() < work_area.x() + kMinimumOnScreenArea) {
+        int delta = work_area.x() + kMinimumOnScreenArea - new_bounds.right();
+        new_bounds.set_width(new_bounds.width() + delta);
+      } else if (new_bounds.x() > work_area.right() - kMinimumOnScreenArea) {
+        int width = new_bounds.right() - work_area.right() +
+                    kMinimumOnScreenArea;
+        new_bounds.set_x(work_area.right() - kMinimumOnScreenArea);
+        new_bounds.set_width(width);
+      }
+    }
+    if (details.size_change_direction & kBoundsChangeDirection_Vertical) {
+      if (!IsBottomEdge(details.window_component) &&
+          new_bounds.y() > work_area.bottom() - kMinimumOnScreenArea) {
+        int height = new_bounds.bottom() - work_area.bottom() +
+                     kMinimumOnScreenArea;
+        new_bounds.set_y(work_area.bottom() - kMinimumOnScreenArea);
+        new_bounds.set_height(height);
+      } else if (details.window_component == HTBOTTOM ||
+                 details.window_component == HTBOTTOMRIGHT ||
+                 details.window_component == HTBOTTOMLEFT) {
+        // Update bottom edge to stay in the work area when we are resizing
+        // by dragging the bottom edge or corners.
+        if (new_bounds.bottom() > work_area.bottom())
+          new_bounds.Inset(0, 0, 0,
+                           new_bounds.bottom() - work_area.bottom());
+      }
+    }
+    if (details.bounds_change & kBoundsChange_Repositions &&
+        new_bounds.y() < 0) {
+      int delta = new_bounds.y();
+      new_bounds.set_y(0);
+      new_bounds.set_height(new_bounds.height() + delta);
+    }
   }
 
-  gfx::Rect new_bounds(origin, size);
-  // Update bottom edge to stay in the work area when we are resizing
-  // by dragging the bottome edge or corners.
-  if (details.window_component == HTBOTTOM ||
-      details.window_component == HTBOTTOMRIGHT ||
-      details.window_component == HTBOTTOMLEFT) {
-    gfx::Rect work_area =
-        ScreenAsh::GetDisplayWorkAreaBoundsInParent(details.window);
-    if (new_bounds.bottom() > work_area.bottom())
-      new_bounds.Inset(0, 0, 0,
-                       new_bounds.bottom() - work_area.bottom());
-  }
-  if (details.bounds_change & kBoundsChange_Resizes &&
-      details.bounds_change & kBoundsChange_Repositions && new_bounds.y() < 0) {
-    int delta = new_bounds.y();
-    new_bounds.set_y(0);
-    new_bounds.set_height(new_bounds.height() + delta);
+  if (details.bounds_change & kBoundsChange_Repositions) {
+    // When we might want to reposition a window which is also restored to its
+    // previous size, to keep the cursor within the dragged window.
+    if (!details.restore_bounds.IsEmpty()) {
+      // However - it is not desirable to change the origin if the window would
+      // be still hit by the cursor.
+      if (details.initial_location_in_parent.x() >
+              details.initial_bounds.x() + details.restore_bounds.width())
+        new_bounds.set_x(location.x() - details.restore_bounds.width() / 2);
+    }
+    // Make sure that the x origin does not leave the screen. Note that y is
+    // taken care of next.
+    new_bounds.set_x(
+        std::max(work_area.x() - new_bounds.width() + kMinimumOnScreenArea,
+                 std::min(work_area.right() - kMinimumOnScreenArea,
+                          new_bounds.x())));
   }
+
   return new_bounds;
 }
 
diff --git a/ash/wm/workspace/workspace_layout_manager2.cc b/ash/wm/workspace/workspace_layout_manager2.cc
index 7f3be99..6731557 100644
--- a/ash/wm/workspace/workspace_layout_manager2.cc
+++ b/ash/wm/workspace/workspace_layout_manager2.cc
@@ -27,6 +27,7 @@
 using aura::Window;
 
 namespace ash {
+
 namespace internal {
 
 namespace {
@@ -292,21 +293,20 @@ void WorkspaceLayoutManager2::AdjustWindowSizeForScreenChange(
     } else if (reason == ADJUST_WINDOW_DISPLAY_INSETS_CHANGED) {
       // If the window is completely outside the display work area, then move it
       // enough to be visible again.
-      const int kMinAreaVisible = 10;
       gfx::Rect bounds = window->bounds();
       if (!work_area_.Intersects(bounds)) {
         int y_offset = 0;
         if (work_area_.bottom() < bounds.y()) {
-          y_offset = work_area_.bottom() - bounds.y() - kMinAreaVisible;
+          y_offset = work_area_.bottom() - bounds.y() - kMinimumOnScreenArea;
         } else if (bounds.bottom() < work_area_.y()) {
-          y_offset = work_area_.y() - bounds.bottom() + kMinAreaVisible;
+          y_offset = work_area_.y() - bounds.bottom() + kMinimumOnScreenArea;
         }
 
         int x_offset = 0;
         if (work_area_.right() < bounds.x()) {
-          x_offset = work_area_.right() - bounds.x() - kMinAreaVisible;
+          x_offset = work_area_.right() - bounds.x() - kMinimumOnScreenArea;
         } else if (bounds.right() < work_area_.x()) {
-          x_offset = work_area_.x() - bounds.right() + kMinAreaVisible;
+          x_offset = work_area_.x() - bounds.right() + kMinimumOnScreenArea;
         }
 
         bounds.Offset(x_offset, y_offset);
diff --git a/ash/wm/workspace/workspace_layout_manager2.h b/ash/wm/workspace/workspace_layout_manager2.h
index 636892d..771a56a 100644
--- a/ash/wm/workspace/workspace_layout_manager2.h
+++ b/ash/wm/workspace/workspace_layout_manager2.h
@@ -27,6 +27,10 @@ class Layer;
 }
 
 namespace ash {
+
+// We force at least this many DIPs for any window on the screen.
+const int kMinimumOnScreenArea = 10;
+
 namespace internal {
 
 class Workspace2;
diff --git a/ash/wm/workspace/workspace_window_resizer_unittest.cc b/ash/wm/workspace/workspace_window_resizer_unittest.cc
index 6457d16..8c80687 100644
--- a/ash/wm/workspace/workspace_window_resizer_unittest.cc
+++ b/ash/wm/workspace/workspace_window_resizer_unittest.cc
@@ -15,6 +15,7 @@
 #include "ash/wm/workspace_controller.h"
 #include "ash/wm/workspace/snap_sizer.h"
 #include "ash/wm/workspace/phantom_window_controller.h"
+#include "ash/wm/workspace/workspace_layout_manager2.h"
 #include "base/string_number_conversions.h"
 #include "base/stringprintf.h"
 #include "ui/aura/root_window.h"
@@ -845,6 +846,66 @@ TEST_F(WorkspaceWindowResizerTest, ResizeBottomOutsideWorkArea) {
   EXPECT_EQ("100,200 300x380", window_->bounds().ToString());
 }
 
+TEST_F(WorkspaceWindowResizerTest, ResizeWindowOutsideLeftWorkArea) {
+  Shell::GetInstance()->SetDisplayWorkAreaInsets(
+      Shell::GetPrimaryRootWindow(), gfx::Insets(0, 0, 50, 0));
+  int left = ScreenAsh::GetDisplayWorkAreaBoundsInParent(window_.get()).x();
+  int pixels_to_left_border = 50;
+  int window_width = 300;
+  int window_x = left - window_width + pixels_to_left_border;
+  window_->SetBounds(gfx::Rect(window_x, 100, window_width, 380));
+  scoped_ptr<WorkspaceWindowResizer> resizer(WorkspaceWindowResizer::Create(
+      window_.get(), gfx::Point(pixels_to_left_border, 0), HTRIGHT,
+      empty_windows()));
+  ASSERT_TRUE(resizer.get());
+  resizer->Drag(CalculateDragPoint(*resizer, -window_width, 0), 0);
+  EXPECT_EQ(base::IntToString(window_x) + ",100 " +
+            base::IntToString(kMinimumOnScreenArea - window_x) +
+            "x380", window_->bounds().ToString());
+}
+
+TEST_F(WorkspaceWindowResizerTest, ResizeWindowOutsideRightWorkArea) {
+  Shell::GetInstance()->SetDisplayWorkAreaInsets(
+      Shell::GetPrimaryRootWindow(), gfx::Insets(0, 0, 50, 0));
+  int right = ScreenAsh::GetDisplayWorkAreaBoundsInParent(
+      window_.get()).right();
+  int pixels_to_right_border = 50;
+  int window_width = 300;
+  int window_x = right - pixels_to_right_border;
+  window_->SetBounds(gfx::Rect(window_x, 100, window_width, 380));
+  scoped_ptr<WorkspaceWindowResizer> resizer(WorkspaceWindowResizer::Create(
+      window_.get(), gfx::Point(window_x, 0), HTLEFT,
+      empty_windows()));
+  ASSERT_TRUE(resizer.get());
+  resizer->Drag(CalculateDragPoint(*resizer, window_width, 0), 0);
+  EXPECT_EQ(base::IntToString(right - kMinimumOnScreenArea) +
+            ",100 " +
+            base::IntToString(window_width - pixels_to_right_border +
+                              kMinimumOnScreenArea) +
+            "x380", window_->bounds().ToString());
+}
+
+TEST_F(WorkspaceWindowResizerTest, ResizeWindowOutsideBottomWorkArea) {
+  Shell::GetInstance()->SetDisplayWorkAreaInsets(
+      Shell::GetPrimaryRootWindow(), gfx::Insets(0, 0, 50, 0));
+  int bottom = ScreenAsh::GetDisplayWorkAreaBoundsInParent(
+      window_.get()).bottom();
+  int delta_to_bottom = 50;
+  int height = 380;
+  window_->SetBounds(gfx::Rect(100, bottom - delta_to_bottom, 300, height));
+  scoped_ptr<WorkspaceWindowResizer> resizer(WorkspaceWindowResizer::Create(
+      window_.get(), gfx::Point(0, bottom - delta_to_bottom), HTTOP,
+      empty_windows()));
+  ASSERT_TRUE(resizer.get());
+  resizer->Drag(CalculateDragPoint(*resizer, 0, bottom), 0);
+  EXPECT_EQ("100," +
+            base::IntToString(bottom - kMinimumOnScreenArea) +
+            " 300x" +
+            base::IntToString(height - (delta_to_bottom -
+                                        kMinimumOnScreenArea)),
+            window_->bounds().ToString());
+}
+
 // Verifies snapping to edges works.
 TEST_F(WorkspaceWindowResizerTest, SnapToEdge) {
   Shell::GetInstance()->SetShelfAutoHideBehavior(