Implement FORM_OnFocus() API.

Given a point, if there is an annotation at the point, give if focus if
it is not focus already. If there is no annotation at the point, then
remove the focus from the focused annotation.

BUG=chromium:754594

Change-Id: Iec3070472bbbfbad9d86e517f25da560f82efd4e
Reviewed-on: https://pdfium-review.googlesource.com/12530
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>

3 files changed, 121 insertions, 0 deletions

diff --git a/testing/resources/javascript/mouse_events.evt b/testing/resources/javascript/mouse_events.evt
new file mode 100644
index 0000000000..57105063e4
--- /dev/null
+++ b/testing/resources/javascript/mouse_events.evt
@@ -0,0 +1,19 @@
+# Mouse in, mouse out.
+mousemove,125,225
+mousemove,125,100
+# Mouse in, click in field.
+mousemove,125,225
+mousedown,left,125,225
+mouseup,left,125,225
+# Mouse out, click elsewhere.
+# This should trigger an On Blur event. (Bug 881)
+mousemove,125,100
+mousedown,left,125,100
+mouseup,left,125,100
+# Mouse in, focus.
+mousemove,125,225
+focus,125,225
+# Mouse out, unfocus.
+# This should trigger an On Blur event. (Bug 881)
+mousemove,125,100
+focus,125,100
diff --git a/testing/resources/javascript/mouse_events.in b/testing/resources/javascript/mouse_events.in
new file mode 100644
index 0000000000..a72162add3
--- /dev/null
+++ b/testing/resources/javascript/mouse_events.in
@@ -0,0 +1,92 @@
+{{header}}
+{{object 1 0}} <<
+  /Type /Catalog
+  /Pages 2 0 R
+  /AcroForm 4 0 R
+>>
+endobj
+{{object 2 0}} <<
+  /Type /Pages
+  /Count 1
+  /Kids [
+    3 0 R
+  ]
+>>
+endobj
+% Page number 0.
+{{object 3 0}} <<
+  /Type /Page
+  /Parent 2 0 R
+  /Resources <<
+    /Font <</F1 20 0 R>>
+  >>
+  /Annots [ 5 0 R ]
+  /Contents [21 0 R]
+  /MediaBox [0 0 612 792]
+>>
+% Forms
+{{object 4 0}} <<
+  /Fields [5 0 R]
+>>
+% Field with actions:
+% Cursor enter: E
+% Cursor exit: X
+% Mouse down: D
+% Mouse up: U
+% Focus: Fo
+% Blur: Bl
+{{object 5 0}} <<
+ /FT /Tx
+ /T (MyField)
+ /Type /Annot
+ /Subtype /Widget
+ /Rect [100 200 150 250]
+ /AA <<
+   /E 10 0 R
+   /X 11 0 R
+   /D 12 0 R
+   /U 13 0 R
+   /Fo 14 0 R
+   /Bl 15 0 R
+ >>
+>>
+{{object 10 0}} <<
+  /Type /Action
+  /S /JavaScript
+  /JS (app.alert\("enter"\);)
+>>
+endobj
+{{object 11 0}} <<
+  /Type /Action
+  /S /JavaScript
+  /JS (app.alert\("exit"\);)
+>>
+endobj
+{{object 12 0}} <<
+  /Type /Action
+  /S /JavaScript
+  /JS (app.alert\("down"\);)
+>>
+endobj
+{{object 13 0}} <<
+  /Type /Action
+  /S /JavaScript
+  /JS (app.alert\("up"\);)
+>>
+endobj
+{{object 14 0}} <<
+  /Type /Action
+  /S /JavaScript
+  /JS (app.alert\("focus"\);)
+>>
+endobj
+{{object 15 0}} <<
+  /Type /Action
+  /S /JavaScript
+  /JS (app.alert\("blur"\);)
+>>
+endobj
+{{xref}}
+{{trailer}}
+{{startxref}}
+%%EOF
diff --git a/testing/resources/javascript/mouse_events_expected.txt b/testing/resources/javascript/mouse_events_expected.txt
new file mode 100644
index 0000000000..3d9b8b6071
--- /dev/null
+++ b/testing/resources/javascript/mouse_events_expected.txt
@@ -0,0 +1,10 @@
+Alert: enter
+Alert: exit
+Alert: enter
+Alert: down
+Alert: focus
+Alert: up
+Alert: exit
+Alert: enter
+Alert: focus
+Alert: exit