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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.
#ifndef PPAPI_CPP_DEV_IME_INPUT_EVENT_DEV_H_
#define PPAPI_CPP_DEV_IME_INPUT_EVENT_DEV_H_
#include <stdint.h>
#include <utility>
#include <vector>
#include "ppapi/c/dev/ppb_ime_input_event_dev.h"
#include "ppapi/cpp/input_event.h"
/// @file
/// This file defines the API used to handle IME input events.
namespace pp {
class Var;
class IMEInputEvent_Dev : public InputEvent {
public:
/// Constructs an is_null() IME input event object.
IMEInputEvent_Dev();
/// Constructs an IME input event object from the provided generic input
/// event. If the given event is itself is_null() or is not an IME input
/// event, the object will be is_null().
///
/// @param[in] event A generic input event.
explicit IMEInputEvent_Dev(const InputEvent& event);
/// This constructor manually constructs an IME event from the provided
/// parameters.
///
/// @param[in] instance The instance for which this event occurred.
///
/// @param[in] type A <code>PP_InputEvent_Type</code> identifying the type of
/// input event. The type must be one of the ime event types.
///
/// @param[in] time_stamp A <code>PP_TimeTicks</code> indicating the time
/// when the event occurred.
///
/// @param[in] text The string returned by <code>GetText</code>.
///
/// @param[in] segment_offsets The array of numbers returned by
/// <code>GetSegmentOffset</code>.
///
/// @param[in] target_segment The number returned by
/// <code>GetTargetSegment</code>.
///
/// @param[in] selection The range returned by <code>GetSelection</code>.
IMEInputEvent_Dev(const InstanceHandle& instance,
PP_InputEvent_Type type,
PP_TimeTicks time_stamp,
const Var& text,
const std::vector<uint32_t>& segment_offsets,
int32_t target_segment,
const std::pair<uint32_t, uint32_t>& selection);
/// Returns the composition text as a UTF-8 string for the given IME event.
///
/// @return A string var representing the composition text. For non-IME
/// input events the return value will be an undefined var.
Var GetText() const;
/// Returns the number of segments in the composition text.
///
/// @return The number of segments. For events other than COMPOSITION_UPDATE,
/// returns 0.
uint32_t GetSegmentNumber() const;
/// Returns the position of the index-th segmentation point in the composition
/// text. The position is given by a byte-offset (not a character-offset) of
/// the string returned by GetText(). It always satisfies
/// 0=GetSegmentOffset(0) < ... < GetSegmentOffset(i) < GetSegmentOffset(i+1)
/// < ... < GetSegmentOffset(GetSegmentNumber())=(byte-length of GetText()).
/// Note that [GetSegmentOffset(i), GetSegmentOffset(i+1)) represents the
/// range of the i-th segment, and hence GetSegmentNumber() can be a valid
/// argument to this function instead of an off-by-1 error.
///
/// @param[in] ime_event A <code>PP_Resource</code> corresponding to an IME
/// event.
///
/// @param[in] index An integer indicating a segment.
///
/// @return The byte-offset of the segmentation point. If the event is not
/// COMPOSITION_UPDATE or index is out of range, returns 0.
uint32_t GetSegmentOffset(uint32_t index) const;
/// Returns the index of the current target segment of composition.
///
/// @return An integer indicating the index of the target segment. When there
/// is no active target segment, or the event is not COMPOSITION_UPDATE,
/// returns -1.
int32_t GetTargetSegment() const;
/// Returns the range selected by caret in the composition text.
///
/// @return A pair of integers indicating the selection range.
std::pair<uint32_t, uint32_t> GetSelection() const;
};
} // namespace pp
#endif // PPAPI_CPP_DEV_IME_INPUT_EVENT_DEV_H_
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