| /* |
| * Copyright 2022 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package androidx.compose.ui.text.input |
| |
| import android.graphics.Matrix |
| import android.view.inputmethod.CursorAnchorInfo |
| import androidx.compose.ui.text.TextLayoutResult |
| import androidx.compose.ui.text.style.ResolvedTextDirection |
| |
| /** |
| * Helper function to build [CursorAnchorInfo](https://developer.android.com/reference/android/view/inputmethod/CursorAnchorInfo). |
| * |
| * @param textFieldValue required to set text, composition and selection information into the |
| * CursorAnchorInfo. |
| * @param textLayoutResult TextLayoutResult for the [textFieldValue] used to enter cursor and |
| * character information |
| * @param matrix Matrix used to convert local coordinates to global coordinates. |
| */ |
| internal fun CursorAnchorInfo.Builder.build( |
| textFieldValue: TextFieldValue, |
| textLayoutResult: TextLayoutResult, |
| matrix: Matrix |
| ): CursorAnchorInfo { |
| reset() |
| |
| setMatrix(matrix) |
| |
| val selectionStart = textFieldValue.selection.min |
| val selectionEnd = textFieldValue.selection.max |
| setSelectionRange(selectionStart, selectionEnd) |
| |
| setInsertionMarker(selectionStart, textLayoutResult) |
| |
| // set composition |
| val compositionStart = textFieldValue.composition?.min ?: -1 |
| val compositionEnd = textFieldValue.composition?.max ?: -1 |
| |
| if (compositionStart in 0 until compositionEnd) { |
| setComposingText( |
| compositionStart, |
| textFieldValue.text.subSequence(compositionStart, compositionEnd) |
| ) |
| } |
| |
| return build() |
| } |
| |
| private fun CursorAnchorInfo.Builder.setInsertionMarker( |
| selectionStart: Int, |
| textLayoutResult: TextLayoutResult |
| ): CursorAnchorInfo.Builder { |
| if (selectionStart < 0) return this |
| |
| val cursorRect = textLayoutResult.getCursorRect(selectionStart) |
| val isRtl = textLayoutResult.getBidiRunDirection(selectionStart) == ResolvedTextDirection.Rtl |
| |
| var flags = 0 |
| if (isRtl) flags = flags or CursorAnchorInfo.FLAG_IS_RTL |
| |
| // Sets the location of the text insertion point (zero width cursor) as a rectangle in local |
| // coordinates. |
| setInsertionMarkerLocation( |
| cursorRect.left, |
| cursorRect.top, |
| cursorRect.bottom, |
| cursorRect.bottom, |
| flags |
| ) |
| |
| return this |
| } |
