Maximize window vertically/horizontally when the maximize button is middle/right clicked on Linux

ui/views/widget/desktop_aura/x11_window_event_filter.cc

Index: ui/views/widget/desktop_aura/x11_window_event_filter.cc
diff --git a/ui/views/widget/desktop_aura/x11_window_event_filter.cc b/ui/views/widget/desktop_aura/x11_window_event_filter.cc
index 887bb979e0b16f3facdf5037d93f315cf05cf882..809aec8635d1d75203f5878ea259984f6aae1d54 100644
--- a/ui/views/widget/desktop_aura/x11_window_event_filter.cc
+++ b/ui/views/widget/desktop_aura/x11_window_event_filter.cc
@@ -16,10 +16,13 @@
 #include "ui/base/hit_test.h"
 #include "ui/events/event.h"
 #include "ui/events/event_utils.h"
+#include "ui/gfx/display.h"
+#include "ui/gfx/screen.h"
 #include "ui/gfx/x/x11_types.h"
 #include "ui/views/linux_ui/linux_ui.h"
 #include "ui/views/widget/desktop_aura/desktop_window_tree_host.h"
 #include "ui/views/widget/native_widget_aura.h"
+#include "ui/views/widget/widget.h"
 
 namespace {
 
@@ -96,9 +99,6 @@ void X11WindowEventFilter::OnMouseEvent(ui::MouseEvent* event) {
   if (event->type() != ui::ET_MOUSE_PRESSED)
     return;
 
-  if (!(event->IsLeftMouseButton() || event->IsMiddleMouseButton()))
-    return;
-
   aura::Window* target = static_cast<aura::Window*>(event->target());
   if (!target->delegate())
     return;
@@ -110,10 +110,29 @@ void X11WindowEventFilter::OnMouseEvent(ui::MouseEvent* event) {
     previous_click_component = click_component_;
     click_component_ = component;
   }
-  if (component == HTCLIENT)
-    return;
 
-  if (event->IsMiddleMouseButton() && (component == HTCAPTION)) {
+  if (component == HTCAPTION) {
+    OnClickedCaption(event, previous_click_component);
+  } else if (component == HTMAXBUTTON) {
+    OnClickedMaximizeButton(event);
+  } else {
+    // Get the |x_root_window_| location out of the native event.
+    if (event->IsLeftMouseButton() && event->native_event()) {
+      const gfx::Point x_root_location =
+          ui::EventSystemLocationFromNative(event->native_event());
+      if (target->GetProperty(aura::client::kCanResizeKey) &&
+          DispatchHostWindowDragMovement(component, x_root_location)) {
+        event->StopPropagation();
+      }
+    }
+  }
+}
+
+void X11WindowEventFilter::OnClickedCaption(ui::MouseEvent* event,
+                                            int previous_click_component) {
+  aura::Window* target = static_cast<aura::Window*>(event->target());
+
+  if (event->IsMiddleMouseButton()) {
     LinuxUI::NonClientMiddleClickAction action =
         LinuxUI::MIDDLE_CLICK_ACTION_LOWER;
     LinuxUI* linux_ui = LinuxUI::instance();
@@ -139,12 +158,10 @@ void X11WindowEventFilter::OnMouseEvent(ui::MouseEvent* event) {
     return;
   }
 
-  // Left button case.
-  if (event->flags() & ui::EF_IS_DOUBLE_CLICK) {
+  if (event->IsLeftMouseButton() && event->flags() & ui::EF_IS_DOUBLE_CLICK) {
     click_component_ = HTNOWHERE;
-    if (component == HTCAPTION &&
-        target->GetProperty(aura::client::kCanMaximizeKey) &&
-        previous_click_component == component) {
+    if (target->GetProperty(aura::client::kCanMaximizeKey) &&
+        previous_click_component == HTCAPTION) {
       // Our event is a double click in the caption area in a window that can be
       // maximized. We are responsible for dispatching this as a minimize/
       // maximize on X11 (Windows converts this to min/max events for us).
@@ -155,14 +172,34 @@ void X11WindowEventFilter::OnMouseEvent(ui::MouseEvent* event) {
   }
 
   // Get the |x_root_window_| location out of the native event.
-  if (event->native_event()) {
+  if (event->IsLeftMouseButton() && event->native_event()) {
     const gfx::Point x_root_location =
         ui::EventSystemLocationFromNative(event->native_event());
-    if ((component == HTCAPTION ||
-         target->GetProperty(aura::client::kCanResizeKey)) &&
-        DispatchHostWindowDragMovement(component, x_root_location)) {
+    if (DispatchHostWindowDragMovement(HTCAPTION, x_root_location))
       event->StopPropagation();
-    }
+  }
+}
+
+void X11WindowEventFilter::OnClickedMaximizeButton(ui::MouseEvent* event) {
+  aura::Window* target = static_cast<aura::Window*>(event->target());
+  views::Widget* widget = views::Widget::GetWidgetForNativeView(target);
+  if (!widget)
+    return;
+
+  gfx::Screen* screen = gfx::Screen::GetNativeScreen();
+  gfx::Rect display_work_area =
+      screen->GetDisplayNearestWindow(target).work_area();
+  gfx::Rect bounds = widget->GetWindowBoundsInScreen();
+  if (event->IsMiddleMouseButton()) {
+    bounds.set_y(display_work_area.y());
+    bounds.set_height(display_work_area.height());
+    widget->SetBounds(bounds);
+    event->StopPropagation();
+  } else if (event->IsRightMouseButton()) {
+    bounds.set_x(display_work_area.x());
+    bounds.set_width(display_work_area.width());
+    widget->SetBounds(bounds);
+    event->StopPropagation();
   }
 }