namespace {
// Time it will take the effect to fully recede in ms
-const int kRecedeTimeMs = 1000;
+const int kRecedeTimeMs = 600;
// Time it will take before a pulled glow begins receding in ms
const int kPullTimeMs = 167;
-const float kMaxAlpha = 1.f;
+// Time it will take for a pulled glow to decay to partial strength before
+// release
+const int kPullDecayTimeMs = 2000;
+
+const float kMaxAlpha = 0.5f;
const float kPullGlowBegin = 0.f;
// How much dragging should effect the height of the glow image.
// Number determined by user testing.
-const float kPullDistanceAlphaGlowFactor = 1.1f;
+const float kPullDistanceAlphaGlowFactor = 0.8f;
-const int kVelocityGlowFactor = 12;
+const int kVelocityGlowFactor = 6;
const ui::SystemUIResourceManager::ResourceType kResourceType =
ui::SystemUIResourceManager::OVERSCROLL_GLOW_L;
glow_scale_y_finish_ = 0.f;
break;
case STATE_PULL:
- // Hold in this state until explicitly released.
+ state_ = STATE_PULL_DECAY;
+ start_time_ = current_time;
+ duration_ = base::TimeDelta::FromMilliseconds(kPullDecayTimeMs);
+
+ glow_alpha_start_ = glow_alpha_;
+ glow_scale_y_start_ = glow_scale_y_;
+
+ // After pull, the glow should fade to nothing.
+ glow_alpha_finish_ = 0.f;
+ glow_scale_y_finish_ = 0.f;
break;
case STATE_PULL_DECAY:
state_ = STATE_RECEDE;
const float r = size.width() * 0.75f / kSin;
const float y = kCos * r;
const float h = r - y;
+ const float o_r = size.height() * 0.75f / kSin;
+ const float o_y = kCos * o_r;
+ const float o_h = o_r - o_y;
+ const float base_glow_scale = h > 0.f ? std::min(o_h / h, 1.f) : 1.f;
bounds_ = gfx::Size(size.width(), (int)std::min(size.height(), h));
- gfx::Size image_bounds(r, std::min(1.f, glow_scale_y_) * bounds_.height());
+ gfx::Size image_bounds(
+ r, std::min(1.f, glow_scale_y_) * base_glow_scale * bounds_.height());
glow_->SetIsDrawable(true);
glow_->SetUIResourceId(resource_manager_->GetUIResourceId(kResourceType));