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adjust canvas offset when scale

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open-trade 2020-11-25 14:41:57 +08:00
parent 2606a44f77
commit b04f90ef67
1 changed files with 16 additions and 3 deletions
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19
flutter_hbb/lib/model.dart
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@ -1,4 +1,5 @@
import 'package:ffi/ffi.dart';
import 'package:flutter/gestures.dart';
import 'package:path_provider/path_provider.dart';
import 'dart:io';
import 'dart:math';
@ -210,11 +211,20 @@ class CanvasModel with ChangeNotifier {
}
void updateScale(double v) {
final offset = FFI.cursorModel.offset;
var r = FFI.cursorModel.getVisibleRect();
final px0 = (offset.dx - r.left) * _scale;
final py0 = (offset.dy - r.top) * _scale;
_scale *= v;
final maxs = FFI.imageModel.maxScale;
final mins = FFI.imageModel.minScale;
if (_scale > maxs) _scale = maxs;
if (_scale < mins) _scale = mins;
r = FFI.cursorModel.getVisibleRect();
final px1 = (offset.dx - r.left) * _scale;
final py1 = (offset.dy - r.top) * _scale;
_x -= px1 - px0;
_y -= py1 - py0;
notifyListeners();
}
@ -238,10 +248,11 @@ class CursorModel with ChangeNotifier {
ui.Image get image => _image;
double get x => _x - _displayOriginX;
double get y => _y - _displayOriginY;
Offset get offset => Offset(_x, _y);
double get hotx => _hotx;
double get hoty => _hoty;
// physical display coordinate
// remote physical display coordinate
Rect getVisibleRect() {
final size = MediaQueryData.fromWindow(ui.window).size;
final xoffset = FFI.canvasModel.x;
@ -255,8 +266,10 @@ class CursorModel with ChangeNotifier {
double adjustForKeyboard() {
var keyboardHeight = MediaQueryData.fromWindow(ui.window).viewInsets.bottom;
if (keyboardHeight < 100) return 0;
var h = _y - getVisibleRect().top;
return h > 200 ? h - 200 : 0;
final s = FFI.canvasModel.scale;
final thresh = 120;
var h = (_y - getVisibleRect().top) * s; // local physical display height
return h > thresh ? h - thresh : 0;
}
void updatePan(double dx, double dy) {