commit 234e5a2b57554e83c47b71c4019a02d39c69479a
author Jim Van Verth <jvanverth@google.com> Mon Jul 23 13:46:01 2018 -0400
committer Skia Commit-Bot <skia-commit-bot@chromium.org> Tue Aug 07 17:04:55 2018 +0000
tree 0ec162a4f859c6fcbbb4f58fa9caab99b7464f87
parent 5f0e3a158a94ed5edab1afb3117b43ca6c7f335c

Improve touch support for iOS viewer

Adds pinch-zoom and swipe to change slides.

Bug: skia:
Change-Id: I0860c933208c8cf83027675a9de11b3f782de8e3
Reviewed-on: https://skia-review.googlesource.com/142898
Reviewed-by: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>

tools/viewer/Viewer.cpp

diff --git a/tools/viewer/Viewer.cpp b/tools/viewer/Viewer.cpp
index 9ea36a4..6d5905a 100644
--- a/tools/viewer/Viewer.cpp
+++ b/tools/viewer/Viewer.cpp
@@ -1181,6 +1181,23 @@
     switch (state) {
         case Window::kUp_InputState: {
             fGesture.touchEnd(castedOwner);
+#if defined(SK_BUILD_FOR_IOS)
+            // TODO: move IOS swipe detection higher up into the platform code
+            SkPoint dir;
+            if (fGesture.isFling(&dir)) {
+                // swiping left or right
+                if (SkTAbs(dir.fX) > SkTAbs(dir.fY)) {
+                    if (dir.fX < 0) {
+                        this->setCurrentSlide(fCurrentSlide < fSlides.count() - 1 ?
+                                              fCurrentSlide + 1 : 0);
+                    } else {
+                        this->setCurrentSlide(fCurrentSlide > 0 ?
+                                              fCurrentSlide - 1 : fSlides.count() - 1);
+                    }
+                }
+                fGesture.reset();
+            }
+#endif
             break;
         }
         case Window::kDown_InputState: {