Mac Web Intents Part 11: Progress view

chrome/browser/ui/cocoa/spinner_progress_indicator.mm

+// 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.
+
+#import "chrome/browser/ui/cocoa/spinner_progress_indicator.h"
+
+#include "base/timer.h"
+#include "chrome/browser/download/download_util.h"
+#include "grit/theme_resources.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/gfx/canvas_skia_paint.h"
+#include "ui/gfx/rect.h"
+
+namespace {
+
+// Interval between spinner updates in miliseconds.
+const int kTimerIntervalMs = 1000 / 30;
+
+// Degrees to rotate the indeterminte spinner per second.
+const CGFloat kSpinRateDegreesPerSecond = 270;
+
+// Callback for indeterminte spinner animation timer.
+void OnTimer(SpinnerProgressIndicator* indicator) {
+  [indicator setNeedsDisplay:YES];
+}
+
+}  // namespace
+
+@interface SpinnerProgressIndicator ()
+- (int)progressAngle;
+- (void)updateTimer;
+@end
+
+@implementation SpinnerProgressIndicator
+
+@synthesize percentDone = percentDone_;
+@synthesize isIndeterminate = isIndeterminate_;
+
+- (void)setPercentDone:(int)percent {
+  percentDone_ = percent;
+  [self setNeedsDisplay:YES];
+  [self updateTimer];
+}
+
+- (void)setIsIndeterminate:(BOOL)isIndeterminate {
+  isIndeterminate_ = isIndeterminate;
+  [self setNeedsDisplay:YES];
+  [self updateTimer];
+}
+
+- (void)sizeToFit {
+  ResourceBundle& rb = ResourceBundle::GetSharedInstance();
+  gfx::ImageSkia* foreground = rb.GetImageSkiaNamed(
+      IDR_WEB_INTENT_PROGRESS_FOREGROUND);
+  NSRect frame = [self frame];
+  frame.size.width = foreground->width();
+  frame.size.height = foreground->height();
+  [self setFrame:frame];
+}
+
+- (void)drawRect:(NSRect)rect {
+  NSRect bounds = [self bounds];
+  gfx::CanvasSkiaPaint canvas(bounds, false);
+  canvas.set_composite_alpha(true);
+
+  ResourceBundle& rb = ResourceBundle::GetSharedInstance();
+  gfx::ImageSkia* background = rb.GetImageSkiaNamed(
+      IDR_WEB_INTENT_PROGRESS_BACKGROUND);
+  gfx::ImageSkia* foreground = rb.GetImageSkiaNamed(
+      IDR_WEB_INTENT_PROGRESS_FOREGROUND);
+
+  download_util::PaintCustomDownloadProgress(
+      &canvas,
+      *background,
+      *foreground,
+      foreground->width(),
+      gfx::Rect(NSRectToCGRect(bounds)),
+      [self progressAngle],
+      isIndeterminate_ ? -1 : percentDone_);
+}
+
+- (void)viewDidMoveToWindow {
+  [self updateTimer];
+}
+
+- (int)progressAngle {
+  if (!isIndeterminate_)
+    return download_util::kStartAngleDegrees;
+  base::TimeDelta delta = base::TimeTicks::Now() - startTime_;
+  int angle = delta.InSecondsF() * kSpinRateDegreesPerSecond;
+  return angle % 360;
+}
+
+- (void)updateTimer {
+  // Only run the timer if the control is in a window and showing an
+  // indeterminte progress.
+  if (![self window] || !isIndeterminate_) {
+    timer_.reset();
+    return;
+  }
+
+  if (!timer_.get()) {
+    startTime_ = base::TimeTicks::Now();
+    timer_.reset(new base::Timer(
+        FROM_HERE,
+        base::TimeDelta::FromMilliseconds(kTimerIntervalMs),
+        base::Bind(OnTimer, self),
+        true));
+    timer_->Reset();
+  }
+}
+
+@end