308adbb418
Change-Id: Ifd3963e6bb337832c287f2b0553315828a5d3889 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/216350 Reviewed-by: Hal Canary <halcanary@google.com> Commit-Queue: Hal Canary <halcanary@google.com>
249 lines
9.4 KiB
C++
249 lines
9.4 KiB
C++
// Copyright 2019 Google LLC.
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// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
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// [Work In Progress] Proof of principle of a text editor written with Skia & SkShaper.
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// https://bugs.skia.org/9020
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#include "include/core/SkCanvas.h"
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#include "include/core/SkSurface.h"
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#include "include/core/SkTime.h"
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#include "tools/sk_app/Application.h"
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#include "tools/sk_app/Window.h"
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#include "experimental/editor/editor.h"
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#include <memory>
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static const char* key_name(sk_app::Window::Key k) {
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switch (k) {
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#define M(X) case sk_app::Window::Key::k ## X: return #X
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M(NONE); M(LeftSoftKey); M(RightSoftKey); M(Home); M(Back); M(Send); M(End); M(0); M(1);
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M(2); M(3); M(4); M(5); M(6); M(7); M(8); M(9); M(Star); M(Hash); M(Up); M(Down); M(Left);
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M(Right); M(Tab); M(PageUp); M(PageDown); M(Delete); M(Escape); M(Shift); M(Ctrl);
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M(Option); M(A); M(C); M(V); M(X); M(Y); M(Z); M(OK); M(VolUp); M(VolDown); M(Power);
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M(Camera);
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#undef M
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default: return "?";
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}
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}
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static SkString modifiers_desc(uint32_t m) {
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SkString s;
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#define M(X) if (m & sk_app::Window::k ## X ##_ModifierKey) { s.append(" {" #X "}"); }
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M(Shift) M(Control) M(Option) M(Command) M(FirstPress)
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#undef M
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return s;
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}
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static void debug_on_char(SkUnichar c, uint32_t modifiers) {
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SkString m = modifiers_desc(modifiers);
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if ((unsigned)c < 0x100) {
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SkDebugf("char: %c (0x%02X)%s\n", (char)(c & 0xFF), (unsigned)c, m.c_str());
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} else {
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SkDebugf("char: 0x%08X%s\n", (unsigned)c, m.c_str());
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}
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}
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static void debug_on_key(sk_app::Window::Key key, sk_app::Window::InputState, uint32_t modifiers) {
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SkDebugf("key: %s%s\n", key_name(key), modifiers_desc(modifiers).c_str());
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}
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static editor::Editor::Movement convert(sk_app::Window::Key key) {
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switch (key) {
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case sk_app::Window::Key::kLeft: return editor::Editor::Movement::kLeft;
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case sk_app::Window::Key::kRight: return editor::Editor::Movement::kRight;
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case sk_app::Window::Key::kUp: return editor::Editor::Movement::kUp;
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case sk_app::Window::Key::kDown: return editor::Editor::Movement::kDown;
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case sk_app::Window::Key::kHome: return editor::Editor::Movement::kHome;
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case sk_app::Window::Key::kEnd: return editor::Editor::Movement::kEnd;
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default: return editor::Editor::Movement::kNowhere;
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}
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}
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namespace {
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struct Timer {
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double fTime;
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const char* fDesc;
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Timer(const char* desc = "") : fTime(SkTime::GetNSecs()), fDesc(desc) {}
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~Timer() { SkDebugf("%s: %5d μs\n", fDesc, (int)((SkTime::GetNSecs() - fTime) * 1e-3)); }
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};
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struct EditorLayer : public sk_app::Window::Layer {
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sk_app::Window* fParent = nullptr;
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editor::Editor fEditor;
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editor::Editor::TextPosition fTextPos{0, 0};
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editor::Editor::TextPosition fMarkPos;
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int fPos = 0; // window pixel position in file
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int fWidth = 0; // window width
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int fHeight = 0; // window height
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bool fShiftDown = false;
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EditorLayer() {
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fEditor.setFont(SkFont(nullptr, 24));
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}
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void loadFile(const char* path) {
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if (sk_sp<SkData> data = SkData::MakeFromFileName(path)) {
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fEditor.setText((const char*)data->data(), data->size());
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}
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}
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void onPaint(SkSurface* surface) override {
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Timer timer("painting");
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SkCanvas* canvas = surface->getCanvas();
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SkAutoCanvasRestore acr(canvas, true);
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canvas->clipRect({0, 0, (float)fWidth, (float)fHeight});
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canvas->translate(0, -(float)fPos);
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editor::Editor::PaintOpts options;
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options.fCursor = fTextPos;
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options.fBackgroundColor = SkColor4f{0.8f, 0.8f, 0.8f, 1};
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if (fMarkPos != editor::Editor::TextPosition()) {
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options.fSelectionBegin = fMarkPos;
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options.fSelectionEnd = fTextPos;
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}
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fEditor.paint(canvas, options);
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}
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void onResize(int width, int height) override {
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if (SkISize{fWidth, fHeight} != SkISize{width, height}) {
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fHeight = height;
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if (width != fWidth) {
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fWidth = width;
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fEditor.setWidth(fWidth);
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}
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this->inval();
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}
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}
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void onAttach(sk_app::Window* w) override { fParent = w; }
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bool scroll(int delta) {
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int maxPos = std::max(0, fEditor.getHeight() - fHeight / 2);
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int newpos = std::max(0, std::min(fPos + delta, maxPos));
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if (newpos != fPos) {
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fPos = newpos;
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this->inval();
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}
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return true;
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}
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void inval() { if (fParent) { fParent->inval(); } }
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bool onMouseWheel(float delta, uint32_t modifiers) override {
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this->scroll(-(int)(delta * fEditor.font().getSpacing()));
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return true;
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}
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bool onMouse(int x, int y, sk_app::Window::InputState state, uint32_t modifiers) override {
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if (sk_app::Window::kDown_InputState == state) {
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y += fPos;
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editor::Editor::TextPosition pos = fEditor.getPosition(SkIPoint{x, y});
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SkDebugf("select: line:%d column:%d \n", pos.fParagraphIndex, pos.fTextByteIndex);
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if (pos != editor::Editor::TextPosition()) {
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fTextPos = pos;
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this->inval();
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}
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}
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return true;
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}
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bool onChar(SkUnichar c, uint32_t modifiers) override {
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if (0 == (modifiers & (sk_app::Window::kControl_ModifierKey |
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sk_app::Window::kOption_ModifierKey |
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sk_app::Window::kCommand_ModifierKey))) {
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if ((unsigned) c < 0x7F && (unsigned)c >= 0x20) {
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char ch = (char)c;
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fEditor.insert(fTextPos, &ch, 1);
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SkDebugf("insert: %X'%c'\n", (unsigned)c, ch);
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return this->moveCursor(editor::Editor::Movement::kRight);
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}
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}
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debug_on_char(c, modifiers);
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return false;
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}
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bool moveCursor(editor::Editor::Movement m, bool shift = false) {
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if (shift != fShiftDown) {
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fMarkPos = shift ? fTextPos : editor::Editor::TextPosition();
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fShiftDown = shift;
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}
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fTextPos = fEditor.move(m, fTextPos);
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this->inval();
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return true;
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}
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bool onKey(sk_app::Window::Key key,
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sk_app::Window::InputState state,
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uint32_t modifiers) override {
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if (state == sk_app::Window::kDown_InputState) {
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switch (key) {
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case sk_app::Window::Key::kPageDown:
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return this->scroll(fHeight * 4 / 5);
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case sk_app::Window::Key::kPageUp:
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return this->scroll(-fHeight * 4 / 5);
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case sk_app::Window::Key::kLeft:
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case sk_app::Window::Key::kRight:
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case sk_app::Window::Key::kUp:
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case sk_app::Window::Key::kDown:
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case sk_app::Window::Key::kHome:
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case sk_app::Window::Key::kEnd:
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return this->moveCursor(convert(key),
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modifiers & sk_app::Window::kShift_ModifierKey);
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case sk_app::Window::Key::kDelete:
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if (fMarkPos != editor::Editor::TextPosition()) {
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fTextPos = fEditor.remove(fMarkPos, fTextPos);
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fMarkPos = editor::Editor::TextPosition();
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} else {
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fTextPos = fEditor.remove(fTextPos,
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fEditor.move(editor::Editor::Movement::kRight,
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fTextPos));
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}
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this->inval();
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return true;
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case sk_app::Window::Key::kBack:
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if (fMarkPos != editor::Editor::TextPosition()) {
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fTextPos = fEditor.remove(fMarkPos, fTextPos);
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fMarkPos = editor::Editor::TextPosition();
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} else {
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fTextPos = fEditor.remove(fTextPos,
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fEditor.move(editor::Editor::Movement::kLeft,
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fTextPos));
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}
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this->inval();
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return true;
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default:
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break;
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}
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debug_on_key(key, state, modifiers);
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}
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return true;
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}
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};
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struct EditorApplication : public sk_app::Application {
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std::unique_ptr<sk_app::Window> fWindow;
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EditorLayer fLayer;
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EditorApplication(const char* path, void* platformData)
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: fWindow(sk_app::Window::CreateNativeWindow(platformData))
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{
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//sk_app::Window::BackendType backendType = sk_app::Window::kRaster_BackendType;
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sk_app::Window::BackendType backendType = sk_app::Window::kNativeGL_BackendType;
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fWindow->attach(backendType);
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fLayer.inval();
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fLayer.loadFile(path);
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fWindow->pushLayer(&fLayer);
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fWindow->show();
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fLayer.onResize(fWindow->width(), fWindow->height());
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Timer timer("shaping");
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fLayer.fEditor.paint(nullptr, editor::Editor::PaintOpts());
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}
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~EditorApplication() override { fWindow->detach(); }
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void onIdle() override {}
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};
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} // namespace
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sk_app::Application* sk_app::Application::Create(int argc, char** argv, void* dat) {
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return new EditorApplication(argc > 1 ? argv[1] : nullptr, dat);
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}
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