chrome/browser/ui/infobar_container_delegate.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/ui/infobar_container_delegate.h"
   6 #include "ui/gfx/animation/slide_animation.h"
   7
   8 #if defined(TOOLKIT_VIEWS)
   9 #include "ui/views/window/non_client_view.h"
  10 #endif
  11
  12 // static
  13 #if defined(OS_MACOSX)
  14 const int InfoBarContainerDelegate::kSeparatorLineHeight = 1;
  15 const int InfoBarContainerDelegate::kDefaultArrowTargetHeight = 11;
  16 #elif defined(TOOLKIT_VIEWS)
  17 // Views comes second until the Mac browser is Views-based.
  18 const int InfoBarContainerDelegate::kSeparatorLineHeight =
  19     views::NonClientFrameView::kClientEdgeThickness;
  20 const int InfoBarContainerDelegate::kDefaultArrowTargetHeight = 9;
  21 #endif
  22
  23 const int InfoBarContainerDelegate::kDefaultBarTargetHeight = 36;
  24 const int InfoBarContainerDelegate::kMaximumArrowTargetHeight = 24;
  25 const int InfoBarContainerDelegate::kDefaultArrowTargetHalfWidth =
  26     kDefaultArrowTargetHeight;
  27 const int InfoBarContainerDelegate::kMaximumArrowTargetHalfWidth = 14;
  28
  29 InfoBarContainerDelegate::InfoBarContainerDelegate()
  30     : top_arrow_target_height_(kDefaultArrowTargetHeight) {
  31 }
  32
  33 InfoBarContainerDelegate::~InfoBarContainerDelegate() {
  34 }
  35
  36 void InfoBarContainerDelegate::SetMaxTopArrowHeight(
  37     int height,
  38     infobars::InfoBarContainer* container) {
  39   // Decrease the height by the arrow stroke thickness, which is the separator
  40   // line height, because the infobar arrow target heights are without-stroke.
  41   top_arrow_target_height_ = std::min(
  42       std::max(height - kSeparatorLineHeight, 0), kMaximumArrowTargetHeight);
  43   container->UpdateInfoBarArrowTargetHeights();
  44 }
  45
  46 int InfoBarContainerDelegate::ArrowTargetHeightForInfoBar(
  47     size_t index,
  48     const gfx::SlideAnimation& animation) const {
  49   if (!DrawInfoBarArrows(nullptr))
  50     return 0;
  51   if (index == 0)
  52     return top_arrow_target_height_;
  53   if ((index > 1) || animation.IsShowing())
  54     return kDefaultArrowTargetHeight;
  55   // When the first infobar is animating closed, we animate the second infobar's
  56   // arrow target height from the default to the top target height.  Note that
  57   // the animation values here are going from 1.0 -> 0.0 as the top bar closes.
  58   return top_arrow_target_height_ + static_cast<int>(
  59       (kDefaultArrowTargetHeight - top_arrow_target_height_) *
  60           animation.GetCurrentValue());
  61 }
  62
  63 void InfoBarContainerDelegate::ComputeInfoBarElementSizes(
  64     const gfx::SlideAnimation& animation,
  65     int arrow_target_height,
  66     int bar_target_height,
  67     int* arrow_height,
  68     int* arrow_half_width,
  69     int* bar_height) const {
  70   // Find the desired arrow height/half-width.  The arrow area is
  71   // *arrow_height * *arrow_half_width.  When the bar is opening or closing,
  72   // scaling each of these with the square root of the animation value causes a
  73   // linear animation of the area, which matches the perception of the animation
  74   // of the bar portion.
  75   double scale_factor = sqrt(animation.GetCurrentValue());
  76   *arrow_height = static_cast<int>(arrow_target_height * scale_factor);
  77   if (animation.is_animating()) {
  78     *arrow_half_width = static_cast<int>(
  79         std::min(arrow_target_height, kMaximumArrowTargetHalfWidth) *
  80             scale_factor);
  81   } else {
  82     // When the infobar is not animating (i.e. fully open), we set the
  83     // half-width to be proportionally the same distance between its default and
  84     // maximum values as the height is between its.
  85     *arrow_half_width = kDefaultArrowTargetHalfWidth +
  86         ((kMaximumArrowTargetHalfWidth - kDefaultArrowTargetHalfWidth) *
  87          ((*arrow_height - kDefaultArrowTargetHeight) /
  88           (kMaximumArrowTargetHeight - kDefaultArrowTargetHeight)));
  89   }
  90   // Add pixels for the stroke, if the arrow is to be visible at all.  Without
  91   // this, changing the arrow height from 0 to kSeparatorLineHeight would
  92   // produce no visible effect, because the stroke would paint atop the divider
  93   // line above the infobar.
  94   if (*arrow_height)
  95     *arrow_height += kSeparatorLineHeight;
  96
  97   *bar_height = animation.CurrentValueBetween(
  98       0,
  99       (bar_target_height == -1) ? kDefaultBarTargetHeight : bar_target_height);
 100 }