Lacros IME: apply preedit styles.

Bug: 1140537
Test: Ran Lacros with enabling IME locally with JP IME.
Change-Id: Ie4c4533f3352fdfbfb57047bde7176047c311ba9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2487740
Commit-Queue: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Jun Mukai <mukai@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821624}

ui/ozone/platform/wayland/host/wayland_input_method_context.cc

@@ -6,8 +6,10 @@
 
 #include "base/bind.h"
 #include "base/command_line.h"
+#include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/notreached.h"
+#include "base/optional.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "ui/base/ime/composition_text.h"
@@ -28,8 +30,16 @@
 namespace ui {
 namespace {
 
-size_t OffsetFromUTF8Offset(const base::StringPiece& text, uint32_t offset) {
-  return base::UTF8ToUTF16(text.substr(0, offset)).size();
+base::Optional<size_t> OffsetFromUTF8Offset(const base::StringPiece& text,
+                                            uint32_t offset) {
+  if (offset > text.length())
+    return base::nullopt;
+
+  base::string16 converted;
+  if (!base::UTF8ToUTF16(text.data(), offset, &converted))
+    return base::nullopt;
+
+  return converted.size();
 }
 
 }  // namespace
@@ -132,18 +142,67 @@ void WaylandInputMethodContext::SetSurroundingText(
     text_input_->SetSurroundingText(text, selection_range);
 }
 
-void WaylandInputMethodContext::OnPreeditString(const std::string& text,
-                                                int32_t preedit_cursor) {
+void WaylandInputMethodContext::OnPreeditString(
+    base::StringPiece text,
+    const std::vector<SpanStyle>& spans,
+    int32_t preedit_cursor) {
   ui::CompositionText composition_text;
   composition_text.text = base::UTF8ToUTF16(text);
-  composition_text.selection =
-      (preedit_cursor >= 0) ? gfx::Range(OffsetFromUTF8Offset(
-                                  text, static_cast<uint32_t>(preedit_cursor)))
-                            : gfx::Range::InvalidRange();
+  for (const auto& span : spans) {
+    ImeTextSpan text_span;
+    auto start_offset = OffsetFromUTF8Offset(text, span.index);
+    if (!start_offset)
+      continue;
+    text_span.start_offset = *start_offset;
+    auto end_offset = OffsetFromUTF8Offset(text, span.index + span.length);
+    if (!end_offset)
+      continue;
+    text_span.end_offset = *end_offset;
+    bool supported = true;
+    switch (span.style) {
+      case ZWP_TEXT_INPUT_V1_PREEDIT_STYLE_DEFAULT:
+        break;
+      case ZWP_TEXT_INPUT_V1_PREEDIT_STYLE_HIGHLIGHT:
+        text_span.thickness = ImeTextSpan::Thickness::kThick;
+        break;
+      case ZWP_TEXT_INPUT_V1_PREEDIT_STYLE_UNDERLINE:
+        text_span.thickness = ImeTextSpan::Thickness::kThin;
+        break;
+      case ZWP_TEXT_INPUT_V1_PREEDIT_STYLE_SELECTION:
+        text_span.type = ImeTextSpan::Type::kSuggestion;
+        break;
+      case ZWP_TEXT_INPUT_V1_PREEDIT_STYLE_INCORRECT:
+        text_span.type = ImeTextSpan::Type::kMisspellingSuggestion;
+        break;
+      case ZWP_TEXT_INPUT_V1_PREEDIT_STYLE_NONE:
+      case ZWP_TEXT_INPUT_V1_PREEDIT_STYLE_ACTIVE:
+      case ZWP_TEXT_INPUT_V1_PREEDIT_STYLE_INACTIVE:
+      default:
+        VLOG(1) << "Unsupported style. Skipped: " << span.style;
+        supported = false;
+        break;
+    }
+    if (!supported)
+      continue;
+    composition_text.ime_text_spans.push_back(std::move(text_span));
+  }
+
+  if (preedit_cursor < 0) {
+    composition_text.selection = gfx::Range::InvalidRange();
+  } else {
+    auto cursor =
+        OffsetFromUTF8Offset(text, static_cast<uint32_t>(preedit_cursor));
+    if (!cursor) {
+      // Invalid cursor position. Do nothing.
+      return;
+    }
+    composition_text.selection = gfx::Range(*cursor);
+  }
+
   ime_delegate_->OnPreeditChanged(composition_text);
 }
 
-void WaylandInputMethodContext::OnCommitString(const std::string& text) {
+void WaylandInputMethodContext::OnCommitString(base::StringPiece text) {
   ime_delegate_->OnCommit(base::UTF8ToUTF16(text));
 }
 

ui/ozone/platform/wayland/host/wayland_input_method_context.h

@@ -6,9 +6,10 @@
 #define UI_OZONE_PLATFORM_WAYLAND_HOST_WAYLAND_INPUT_METHOD_CONTEXT_H_
 
 #include <memory>
-#include <string>
+#include <vector>
 
 #include "base/macros.h"
+#include "base/strings/string_piece.h"
 #include "ui/base/ime/character_composer.h"
 #include "ui/base/ime/linux/linux_input_method_context.h"
 #include "ui/ozone/platform/wayland/host/wayland_keyboard.h"
@@ -42,9 +43,10 @@ class WaylandInputMethodContext : public LinuxInputMethodContext,
   void Blur() override;
 
   // ui::ZWPTextInputWrapperClient
-  void OnPreeditString(const std::string& text,
+  void OnPreeditString(base::StringPiece text,
+                       const std::vector<SpanStyle>& spans,
                        int32_t preedit_cursor) override;
-  void OnCommitString(const std::string& text) override;
+  void OnCommitString(base::StringPiece text) override;
   void OnDeleteSurroundingText(int32_t index, uint32_t length) override;
   void OnKeysym(uint32_t keysym, uint32_t state, uint32_t modifiers) override;
 

ui/ozone/platform/wayland/host/zwp_text_input_wrapper.h

@@ -5,9 +5,13 @@
 #ifndef UI_OZONE_PLATFORM_WAYLAND_HOST_ZWP_TEXT_INPUT_WRAPPER_H_
 #define UI_OZONE_PLATFORM_WAYLAND_HOST_ZWP_TEXT_INPUT_WRAPPER_H_
 
-#include "ui/ozone/platform/wayland/common/wayland_object.h"
+#include <stdint.h>
+
+#include <vector>
 
 #include "base/strings/string16.h"
+#include "base/strings/string_piece.h"
+#include "ui/ozone/platform/wayland/common/wayland_object.h"
 
 namespace gfx {
 class Rect;
@@ -22,19 +26,26 @@ class WaylandWindow;
 // Client interface which handles wayland text input callbacks
 class ZWPTextInputWrapperClient {
  public:
-  virtual ~ZWPTextInputWrapperClient() {}
+  struct SpanStyle {
+    uint32_t index;   // Byte offset.
+    uint32_t length;  // Length in bytes.
+    uint32_t style;   // One of preedit_style.
+  };
+
+  virtual ~ZWPTextInputWrapperClient() = default;
 
   // Called when a new composing text (pre-edit) should be set around the
   // current cursor position. Any previously set composing text should
   // be removed.
   // Note that the preedit_cursor is byte-offset.
-  virtual void OnPreeditString(const std::string& text,
+  virtual void OnPreeditString(base::StringPiece text,
+                               const std::vector<SpanStyle>& spans,
                                int32_t preedit_cursor) = 0;
 
   // Called when a complete input sequence has been entered.  The text to
   // commit could be either just a single character after a key press or the
   // result of some composing (pre-edit).
-  virtual void OnCommitString(const std::string& text) = 0;
+  virtual void OnCommitString(base::StringPiece text) = 0;
 
   // Called when client needs to delete all or part of the text surrounding
   // the cursor
@@ -52,7 +63,7 @@ class ZWPTextInputWrapperClient {
 // IME. This interface collects the functionality behind one wrapper API.
 class ZWPTextInputWrapper {
  public:
-  virtual ~ZWPTextInputWrapper() {}
+  virtual ~ZWPTextInputWrapper() = default;
 
   virtual void Initialize(WaylandConnection* connection,
                           ZWPTextInputWrapperClient* client) = 0;

ui/ozone/platform/wayland/host/zwp_text_input_wrapper_v1.cc

@@ -4,6 +4,9 @@
 
 #include "ui/ozone/platform/wayland/host/zwp_text_input_wrapper_v1.h"
 
+#include <string>
+#include <utility>
+
 #include "base/memory/ptr_util.h"
 #include "base/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
@@ -33,7 +36,6 @@ ZWPTextInputWrapperV1::ZWPTextInputWrapperV1(
       &ZWPTextInputWrapperV1::OnLanguage,       // text_input_language,
       &ZWPTextInputWrapperV1::OnTextDirection,  // text_input_text_direction
   };
-  ResetInputEventState();
 
   zwp_text_input_v1* text_input =
       zwp_text_input_manager_v1_create_text_input(text_input_manager);
@@ -87,6 +89,7 @@ void ZWPTextInputWrapperV1::SetSurroundingText(
 }
 
 void ZWPTextInputWrapperV1::ResetInputEventState() {
+  spans_.clear();
   preedit_cursor_ = -1;
 }
 
@@ -121,9 +124,10 @@ void ZWPTextInputWrapperV1::OnPreeditString(
     const char* text,
     const char* commit) {
   ZWPTextInputWrapperV1* wti = static_cast<ZWPTextInputWrapperV1*>(data);
+  auto spans = std::move(wti->spans_);
   int32_t preedit_cursor = wti->preedit_cursor_;
   wti->ResetInputEventState();
-  wti->client_->OnPreeditString(std::string(text), preedit_cursor);
+  wti->client_->OnPreeditString(text, spans, preedit_cursor);
 }
 
 void ZWPTextInputWrapperV1::OnPreeditStyling(
@@ -132,7 +136,9 @@ void ZWPTextInputWrapperV1::OnPreeditStyling(
     uint32_t index,
     uint32_t length,
     uint32_t style) {
-  NOTIMPLEMENTED_LOG_ONCE();
+  ZWPTextInputWrapperV1* wti = static_cast<ZWPTextInputWrapperV1*>(data);
+  wti->spans_.push_back(
+      ZWPTextInputWrapperClient::SpanStyle{index, length, style});
 }
 
 void ZWPTextInputWrapperV1::OnPreeditCursor(
@@ -149,7 +155,7 @@ void ZWPTextInputWrapperV1::OnCommitString(void* data,
                                            const char* text) {
   ZWPTextInputWrapperV1* wti = static_cast<ZWPTextInputWrapperV1*>(data);
   wti->ResetInputEventState();
-  wti->client_->OnCommitString(std::string(text));
+  wti->client_->OnCommitString(text);
 }
 
 void ZWPTextInputWrapperV1::OnCursorPosition(

ui/ozone/platform/wayland/host/zwp_text_input_wrapper_v1.h

@@ -5,8 +5,11 @@
 #ifndef UI_OZONE_PLATFORM_WAYLAND_HOST_ZWP_TEXT_INPUT_WRAPPER_V1_H_
 #define UI_OZONE_PLATFORM_WAYLAND_HOST_ZWP_TEXT_INPUT_WRAPPER_V1_H_
 
+#include <stdint.h>
+
+#include <vector>
+
 #include <text-input-unstable-v1-client-protocol.h>
-#include <string>
 
 #include "ui/ozone/platform/wayland/host/zwp_text_input_wrapper.h"
 
@@ -98,7 +101,8 @@ class ZWPTextInputWrapperV1 : public ZWPTextInputWrapper {
   wl::Object<zwp_text_input_v1> obj_;
   ZWPTextInputWrapperClient* client_;
 
-  int32_t preedit_cursor_;
+  std::vector<ZWPTextInputWrapperClient::SpanStyle> spans_;
+  int32_t preedit_cursor_ = -1;
 };
 
 }  // namespace ui