1 files changed, 174 insertions, 0 deletions
diff --git a/ui/views/widget/tooltip_manager_gtk.cc b/ui/views/widget/tooltip_manager_gtk.cc
new file mode 100644
index 0000000..b33e5ad
--- /dev/null
+++ b/ui/views/widget/tooltip_manager_gtk.cc
@@ -0,0 +1,174 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ui/views/widget/tooltip_manager_gtk.h"
+
+#include "base/logging.h"
+#include "base/utf_string_conversions.h"
+#include "ui/gfx/font.h"
+#include "ui/gfx/screen.h"
+#include "ui/views/focus/focus_manager.h"
+#include "ui/views/widget/native_widget_gtk.h"
+#include "views/view.h"
+
+// WARNING: this implementation is good for a start, but it doesn't give us
+// control of tooltip positioning both on mouse events and when showing from
+// keyboard. We may need to write our own to give us the control we need.
+
+namespace views {
+
+static gfx::Font* LoadDefaultFont() {
+  // Create a tooltip widget and extract the font from it (we have to realize
+  // it to make sure the correct font gets set).
+  GtkWidget* window = gtk_window_new(GTK_WINDOW_POPUP);
+  gtk_widget_set_name(window, "gtk-tooltip");
+  GtkWidget* label = gtk_label_new("");
+  gtk_widget_show(label);
+
+  gtk_container_add(GTK_CONTAINER(window), label);
+  gtk_widget_realize(window);
+
+  GtkStyle* style = gtk_widget_get_style(label);
+  gfx::Font* font = new gfx::Font(style->font_desc);
+
+  gtk_widget_destroy(window);
+
+  return font;
+}
+
+// static
+int TooltipManager::GetTooltipHeight() {
+  // This is only used to position the tooltip, and we don't yet support
+  // positioning the tooltip, it isn't worth trying to implement this.
+  return 0;
+}
+
+// static
+gfx::Font TooltipManager::GetDefaultFont() {
+  static gfx::Font* font = NULL;
+  if (!font)
+    font = LoadDefaultFont();
+
+  return *font;
+}
+
+// static
+int TooltipManager::GetMaxWidth(int x, int y) {
+  gfx::Rect monitor_bounds =
+      gfx::Screen::GetMonitorAreaNearestPoint(gfx::Point(x, y));
+  // GtkLabel (gtk_label_ensure_layout) forces wrapping at this size. We mirror
+  // the size here otherwise tooltips wider than the size used by gtklabel end
+  // up with extraneous empty lines.
+  return monitor_bounds.width() == 0 ? 800 : (monitor_bounds.width() + 1) / 2;
+}
+
+TooltipManagerGtk::TooltipManagerGtk(NativeWidgetGtk* widget)
+    : widget_(widget),
+      keyboard_view_(NULL),
+      tooltip_window_(widget->window_contents()) {
+}
+
+bool TooltipManagerGtk::ShowTooltip(int x, int y, bool for_keyboard,
+                                    GtkTooltip* tooltip) {
+  const View* view = NULL;
+  gfx::Point view_loc;
+  if (keyboard_view_) {
+    view = keyboard_view_;
+    view_loc.SetPoint(view->width() / 2, view->height() / 2);
+  } else if (!for_keyboard) {
+    View* root_view = widget_->GetWidget()->GetRootView();
+    view = root_view->GetEventHandlerForPoint(gfx::Point(x, y));
+    view_loc.SetPoint(x, y);
+    View::ConvertPointFromWidget(view, &view_loc);
+  } else {
+    const FocusManager* focus_manager = widget_->GetWidget()->GetFocusManager();
+    if (focus_manager) {
+      view = focus_manager->GetFocusedView();
+      if (view)
+        view_loc.SetPoint(view->width() / 2, view->height() / 2);
+    }
+  }
+
+  if (!view)
+    return false;
+
+  string16 text;
+  if (!view->GetTooltipText(view_loc, &text))
+    return false;
+
+  // Sets the area of the tooltip. This way if different views in the same
+  // widget have tooltips the tooltip doesn't get stuck at the same location.
+  gfx::Rect vis_bounds = view->GetVisibleBounds();
+  gfx::Point widget_loc(vis_bounds.origin());
+  View::ConvertPointToWidget(view, &widget_loc);
+  GdkRectangle tip_area = { widget_loc.x(), widget_loc.y(),
+                            vis_bounds.width(), vis_bounds.height() };
+  gtk_tooltip_set_tip_area(tooltip, &tip_area);
+
+  int max_width, line_count;
+  gfx::Point screen_loc(x, y);
+  View::ConvertPointToScreen(widget_->GetWidget()->GetRootView(), &screen_loc);
+  TrimTooltipToFit(&text, &max_width, &line_count, screen_loc.x(),
+                   screen_loc.y());
+  tooltip_window_.SetTooltipText(text);
+
+  return true;
+}
+
+void TooltipManagerGtk::UpdateTooltip() {
+  // UpdateTooltip may be invoked after the widget has been destroyed.
+  GtkWidget* widget = widget_->GetNativeView();
+  if (!widget)
+    return;
+
+  GdkDisplay* display = gtk_widget_get_display(widget);
+  if (display)
+    gtk_tooltip_trigger_tooltip_query(display);
+}
+
+void TooltipManagerGtk::TooltipTextChanged(View* view) {
+  UpdateTooltip();
+}
+
+void TooltipManagerGtk::ShowKeyboardTooltip(View* view) {
+  if (view == keyboard_view_)
+    return;  // We're already showing the tip for the specified view.
+
+  // We have to hide the current tooltip, then show again.
+  HideKeyboardTooltip();
+
+  string16 tooltip_text;
+  if (!view->GetTooltipText(gfx::Point(), &tooltip_text))
+    return;  // The view doesn't have a tooltip, nothing to do.
+
+  keyboard_view_ = view;
+  if (!SendShowHelpSignal()) {
+    keyboard_view_ = NULL;
+    return;
+  }
+}
+
+void TooltipManagerGtk::HideKeyboardTooltip() {
+  if (!keyboard_view_)
+    return;
+
+  SendShowHelpSignal();
+  keyboard_view_ = NULL;
+}
+
+bool TooltipManagerGtk::SendShowHelpSignal() {
+  GtkWidget* widget = widget_->window_contents();
+  GType itype = G_TYPE_FROM_INSTANCE(G_OBJECT(widget));
+  guint signal_id;
+  GQuark detail;
+  if (!g_signal_parse_name("show_help", itype, &signal_id, &detail, FALSE)) {
+    NOTREACHED();
+    return false;
+  }
+  gboolean result;
+  g_signal_emit(widget, signal_id, 0, GTK_WIDGET_HELP_TOOLTIP, &result);
+  return true;
+}
+
+}  // namespace views