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authorBo Xu <bo_xu@foxitsoftware.com>2014-10-28 23:03:33 -0700
committerBo Xu <bo_xu@foxitsoftware.com>2014-11-03 11:10:11 -0800
commitfdc00a7042d912aafaabddae4d9c84199921ef23 (patch)
tree32ab8ac91cc68d2cd15b9168782a71b3f3f5e7b9 /xfa_test/pdf/fading_control.cc
parente9b38fa38de2c95d8260be31c57d9272c4d127ed (diff)
downloadpdfium-fdc00a7042d912aafaabddae4d9c84199921ef23.tar.xz
Merge XFA to PDFium master at 4dc95e7 on 10/28/2014
Diffstat (limited to 'xfa_test/pdf/fading_control.cc')
-rw-r--r--xfa_test/pdf/fading_control.cc75
1 files changed, 75 insertions, 0 deletions
diff --git a/xfa_test/pdf/fading_control.cc b/xfa_test/pdf/fading_control.cc
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index 0000000000..7e4d8ef63e
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+++ b/xfa_test/pdf/fading_control.cc
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+// Copyright (c) 2012 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 "pdf/fading_control.h"
+
+#include <math.h>
+
+#include "base/logging.h"
+#include "pdf/draw_utils.h"
+#include "pdf/resource_consts.h"
+
+namespace chrome_pdf {
+
+FadingControl::FadingControl()
+ : alpha_shift_(0), timer_id_(0) {
+}
+
+FadingControl::~FadingControl() {
+}
+
+void FadingControl::OnTimerFired(uint32 timer_id) {
+ if (timer_id == timer_id_) {
+ int32 new_alpha = transparency() + alpha_shift_;
+ if (new_alpha <= kTransparentAlpha) {
+ Show(false, true);
+ OnFadeOutComplete();
+ return;
+ }
+ if (new_alpha >= kOpaqueAlpha) {
+ AdjustTransparency(kOpaqueAlpha, true);
+ OnFadeInComplete();
+ return;
+ }
+
+ AdjustTransparency(static_cast<uint8>(new_alpha), true);
+ timer_id_ = owner()->ScheduleTimer(id(), kFadingTimeoutMs);
+ }
+}
+
+// Fade In/Out control depending on visible flag over the time of time_ms.
+void FadingControl::Fade(bool show, uint32 time_ms) {
+ DCHECK(time_ms != 0);
+ // Check if we already in the same state.
+ if (!visible() && !show)
+ return;
+ if (!visible() && show) {
+ Show(show, false);
+ AdjustTransparency(kTransparentAlpha, false);
+ OnFadeOutComplete();
+ }
+ if (transparency() == kOpaqueAlpha && show) {
+ OnFadeInComplete();
+ return;
+ }
+
+ int delta = show ? kOpaqueAlpha - transparency() : transparency();
+ double shift =
+ static_cast<double>(delta) * kFadingTimeoutMs / time_ms;
+ if (shift > delta)
+ alpha_shift_ = delta;
+ else
+ alpha_shift_ = static_cast<int>(ceil(shift));
+
+ if (alpha_shift_ == 0)
+ alpha_shift_ = 1;
+
+ // If disabling, make alpha shift negative.
+ if (!show)
+ alpha_shift_ = -alpha_shift_;
+
+ timer_id_ = owner()->ScheduleTimer(id(), kFadingTimeoutMs);
+}
+
+} // namespace chrome_pdf