Closes emscripten-core#28

Add fcitx4's show input method status when focus in.

Author: wengxt

src/lib/fcitx/globalconfig.cpp

@@ -105,6 +105,9 @@ FCITX_CONFIGURATION(
     Option<bool> showInputMethodInformation{
         this, "ShowInputMethodInformation",
         _("Show Input Method Information when switch input method"), true};
+    Option<bool> showInputMethodInformationWhenFocusIn{
+        this, "showInputMethodInformationWhenFocusIn",
+        _("Show Input Method Information when changing focus"), false};
     Option<int, IntConstrain> defaultPageSize{this, "DefaultPageSize",
                                               _("Default page size"), 5,
                                               IntConstrain(1, 10)};
@@ -190,6 +193,11 @@ bool GlobalConfig::showInputMethodInformation() const {
     return d->behavior->showInputMethodInformation.value();
 }
 
+bool GlobalConfig::showInputMethodInformationWhenFocusIn() const {
+    FCITX_D();
+    return d->behavior->showInputMethodInformationWhenFocusIn.value();
+}
+
 const KeyList &GlobalConfig::defaultPrevPage() const {
     FCITX_D();
     return d->hotkey->defaultPrevPage.value();

src/lib/fcitx/globalconfig.h

@@ -45,6 +45,7 @@ class FCITXCORE_EXPORT GlobalConfig {
     const KeyList &enumerateGroupBackwardKeys() const;
     bool activeByDefault() const;
     bool showInputMethodInformation() const;
+    bool showInputMethodInformationWhenFocusIn() const;
 
     const KeyList &defaultPrevPage() const;
     const KeyList &defaultNextPage() const;

src/lib/fcitx/instance.cpp

@@ -318,6 +318,7 @@ class InstancePrivate : public QPtrHolder<Instance> {
 
     std::vector<ScopedConnection> connections_;
     std::unique_ptr<EventSourceTime> imGroupInfoTimer_;
+    std::unique_ptr<EventSourceTime> focusInImInfoTimer_;
 
     std::unordered_map<std::string,
                        std::unordered_map<std::string, xkb_keymap_autoptr>>
@@ -643,9 +644,24 @@ Instance::Instance(int argc, char **argv) {
         }));
     d->eventWatchers_.emplace_back(d->watchEvent(
         EventType::InputContextFocusIn, EventWatcherPhase::ReservedFirst,
-        [this](Event &event) {
+        [this, d](Event &event) {
             auto &icEvent = static_cast<InputContextEvent &>(event);
             activateInputMethod(icEvent);
+            if (!d->globalConfig_.showInputMethodInformationWhenFocusIn()) {
+                return;
+            }
+            // Give some time because the cursor location may need some time
+            // to be updated.
+            d->focusInImInfoTimer_ = d->eventLoop_.addTimeEvent(
+                CLOCK_MONOTONIC, now(CLOCK_MONOTONIC) + 30000, 0,
+                [this, icRef = icEvent.inputContext()->watch()](
+                    EventSourceTime *, uint64_t) {
+                    // Check if ic is still valid and has focus.
+                    if (auto ic = icRef.get(); ic && ic->hasFocus()) {
+                        showInputMethodInformation(ic);
+                    }
+                    return true;
+                });
         }));
     d->eventWatchers_.emplace_back(d->watchEvent(
         EventType::InputContextFocusOut, EventWatcherPhase::ReservedFirst,