First cut at implementation of FindBar for views / gtk...

chrome/browser/views/find_bar_host_win.cc

+// Copyright (c) 2006-2009 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 "chrome/browser/views/find_bar_host.h"
+
+#include "chrome/browser/find_bar_controller.h"
+#include "chrome/browser/renderer_host/render_view_host.h"
+#include "chrome/browser/tab_contents/tab_contents.h"
+#include "chrome/browser/tab_contents/tab_contents_view.h"
+#include "chrome/browser/views/frame/browser_view.h"
+#include "views/controls/scrollbar/native_scroll_bar.h"
+#include "views/widget/widget_win.h"
+
+class FindBarHostWidget : public views::WidgetWin {
+ public:
+  explicit FindBarHostWidget(FindBarHost* find_bar) : find_bar_(find_bar) {
+    // Don't let WidgetWin manage our lifetime. We want our lifetime to
+    // coincide with TabContents.
+    set_delete_on_destroy(false);
+    set_window_style(WS_CHILD | WS_CLIPCHILDREN);
+    set_window_ex_style(WS_EX_TOPMOST);
+  }
+
+  void OnFinalMessage(HWND window) {
+    find_bar_->OnFinalMessage();
+  }
+
+ private:
+  FindBarHost* find_bar_;
+
+  DISALLOW_COPY_AND_ASSIGN(FindBarHostWidget);
+};
+
+// TODO(brettw) this should not be so complicated. The view should really be in
+// charge of these regions. CustomFrameWindow will do this for us. It will also
+// let us set a path for the window region which will avoid some logic here.
+void FindBarHost::UpdateWindowEdges(const gfx::Rect& new_pos) {
+  // |w| is used to make it easier to create the part of the polygon that curves
+  // the right side of the Find window. It essentially keeps track of the
+  // x-pixel position of the right-most background image inside the view.
+  // TODO(finnur): Let the view tell us how to draw the curves or convert
+  // this to a CustomFrameWindow.
+  int w = new_pos.width() - 6;  // -6 positions us at the left edge of the
+                                // rightmost background image of the view.
+
+  // This polygon array represents the outline of the background image for the
+  // dialog. Basically, it encompasses only the visible pixels of the
+  // concatenated find_dlg_LMR_bg images (where LMR = [left | middle | right]).
+  static const POINT polygon[] = {
+      {0, 0}, {0, 1}, {2, 3}, {2, 29}, {4, 31},
+        {4, 32}, {w+0, 32},
+      {w+0, 31}, {w+1, 31}, {w+3, 29}, {w+3, 3}, {w+6, 0}
+  };
+
+  // Find the largest x and y value in the polygon.
+  int max_x = 0, max_y = 0;
+  for (int i = 0; i < arraysize(polygon); i++) {
+    max_x = std::max(max_x, static_cast<int>(polygon[i].x));
+    max_y = std::max(max_y, static_cast<int>(polygon[i].y));
+  }
+
+  // We then create the polygon and use SetWindowRgn to force the window to draw
+  // only within that area. This region may get reduced in size below.
+  HRGN region = CreatePolygonRgn(polygon, arraysize(polygon), ALTERNATE);
+
+  // Are we animating?
+  if (find_dialog_animation_offset_ > 0) {
+    // The animation happens in two steps: First, we clip the window and then in
+    // GetDialogPosition we offset the window position so that it still looks
+    // attached to the toolbar as it grows. We clip the window by creating a
+    // rectangle region (that gradually increases as the animation progresses)
+    // and find the intersection between the two regions using CombineRgn.
+
+    // |y| shrinks as the animation progresses from the height of the view down
+    // to 0 (and reverses when closing).
+    int y = find_dialog_animation_offset_;
+    // |y| shrinking means the animation (visible) region gets larger. In other
+    // words: the rectangle grows upward (when the dialog is opening).
+    HRGN animation_region = CreateRectRgn(0, y, max_x, max_y);
+    // |region| will contain the intersected parts after calling this function:
+    CombineRgn(region, animation_region, region, RGN_AND);
+    DeleteObject(animation_region);
+
+    // Next, we need to increase the region a little bit to account for the
+    // curved edges that the view will draw to make it look like grows out of
+    // the toolbar.
+    POINT left_curve[] = {
+      {0, y+0}, {0, y+1}, {2, y+3}, {2, y+0}, {0, y+0}
+    };
+    POINT right_curve[] = {
+      {w+3, y+3}, {w+6, y+0}, {w+3, y+0}, {w+3, y+3}
+    };
+
+    // Combine the region for the curve on the left with our main region.
+    HRGN r = CreatePolygonRgn(left_curve, arraysize(left_curve), ALTERNATE);
+    CombineRgn(region, r, region, RGN_OR);
+    DeleteObject(r);
+
+    // Combine the region for the curve on the right with our main region.
+    r = CreatePolygonRgn(right_curve, arraysize(right_curve), ALTERNATE);
+    CombineRgn(region, r, region, RGN_OR);
+    DeleteObject(r);
+  }
+
+  // Now see if we need to truncate the region because parts of it obscures
+  // the main window border.
+  gfx::Rect dialog_bounds;
+  GetDialogBounds(&dialog_bounds);
+
+  // Calculate how much our current position overlaps our boundaries. If we
+  // overlap, it means we have too little space to draw the whole dialog and
+  // we allow overwriting the scrollbar before we start truncating our dialog.
+  //
+  // TODO(brettw) this constant is evil. This is the amount of room we've added
+  // to the window size, when we set the region, it can change the size.
+  static const int kAddedWidth = 7;
+  int difference = (new_pos.right() - kAddedWidth) -
+                   dialog_bounds.width() -
+                   views::NativeScrollBar::GetVerticalScrollBarWidth() +
+                   1;
+  if (difference > 0) {
+    POINT exclude[4] = {0};
+    exclude[0].x = max_x - difference;  // Top left corner.
+    exclude[0].y = 0;
+
+    exclude[1].x = max_x;               // Top right corner.
+    exclude[1].y = 0;
+
+    exclude[2].x = max_x;               // Bottom right corner.
+    exclude[2].y = max_y;
+
+    exclude[3].x = max_x - difference;  // Bottom left corner.
+    exclude[3].y = max_y;
+
+    // Subtract this region from the original region.
+    HRGN exclude_rgn = CreatePolygonRgn(exclude, arraysize(exclude), ALTERNATE);
+    int result = CombineRgn(region, region, exclude_rgn, RGN_DIFF);
+    DeleteObject(exclude_rgn);
+  }
+
+  // The system now owns the region, so we do not delete it.
+  ::SetWindowRgn(host_->GetNativeView(), region, TRUE);  // TRUE = Redraw.
+}
+
+NativeWebKeyboardEvent FindBarHost::GetKeyboardEvent(
+     const TabContents* contents,
+     const views::Textfield::Keystroke& key_stroke) {
+  HWND hwnd = contents->GetContentNativeView();
+  return NativeWebKeyboardEvent(
+      hwnd, key_stroke.message(), key_stroke.key(), 0);
+}
+
+void FindBarHost::AudibleAlert() {
+  MessageBeep(MB_OK);
+}
+
+views::Widget* FindBarHost::CreateHost() {
+  return new FindBarHostWidget(this);
+}
+
+void FindBarHost::SetDialogPositionNative(const gfx::Rect& new_pos,
+                                          bool no_redraw) {
+  gfx::Rect window_rect;
+  host_->GetBounds(&window_rect, true);
+  DWORD swp_flags = SWP_NOOWNERZORDER;
+  if (!window_rect.IsEmpty())
+    swp_flags |= SWP_NOSIZE;
+  if (no_redraw)
+    swp_flags |= SWP_NOREDRAW;
+  if (!host_->IsVisible())
+    swp_flags |= SWP_SHOWWINDOW;
+
+  ::SetWindowPos(host_->GetNativeView(), HWND_TOP, new_pos.x(), new_pos.y(),
+                 new_pos.width(), new_pos.height(), swp_flags);
+}
+
+void FindBarHost::GetDialogPositionNative(gfx::Rect* avoid_overlapping_rect) {
+  RECT frame_rect = {0}, webcontents_rect = {0};
+  ::GetWindowRect(
+      static_cast<views::WidgetWin*>(host_.get())->GetParent(), &frame_rect);
+  ::GetWindowRect(
+      find_bar_controller_->tab_contents()->view()->GetNativeView(),
+      &webcontents_rect);
+  avoid_overlapping_rect->Offset(0, webcontents_rect.top - frame_rect.top);
+}
+
+gfx::NativeView FindBarHost::GetNativeView(BrowserView* browser_view) {
+  return browser_view->GetWidget()->GetNativeView();
+}
+