logo
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147

// Copyright © SixtyFPS GmbH <info@slint-ui.com>
// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-commercial

/*!
This module contains the builtin Path related items.

When adding an item or a property, it needs to be kept in sync with different place.
Lookup the [`crate::items`] module documentation.
*/

use super::{FillRule, Item, ItemConsts, ItemRc, ItemRendererRef, RenderingResult};
use crate::graphics::{Brush, PathData, PathDataIterator, Rect};
use crate::input::{
    FocusEvent, FocusEventResult, InputEventFilterResult, InputEventResult, KeyEvent,
    KeyEventResult, MouseEvent,
};
use crate::item_rendering::CachedRenderingData;

use crate::layout::{LayoutInfo, Orientation};
#[cfg(feature = "rtti")]
use crate::rtti::*;
use crate::window::WindowRc;
use crate::{Coord, Property};
use const_field_offset::FieldOffsets;
use core::pin::Pin;
use i_slint_core_macros::*;

/// The implementation of the `Path` element
#[repr(C)]
#[derive(FieldOffsets, Default, SlintElement)]
#[pin]
pub struct Path {
    pub x: Property<Coord>,
    pub y: Property<Coord>,
    pub width: Property<Coord>,
    pub height: Property<Coord>,
    pub elements: Property<PathData>,
    pub fill: Property<Brush>,
    pub fill_rule: Property<FillRule>,
    pub stroke: Property<Brush>,
    pub stroke_width: Property<Coord>,
    pub viewbox_x: Property<f32>,
    pub viewbox_y: Property<f32>,
    pub viewbox_width: Property<f32>,
    pub viewbox_height: Property<f32>,
    pub clip: Property<bool>,
    pub cached_rendering_data: CachedRenderingData,
}

impl Item for Path {
    fn init(self: Pin<&Self>, _window: &WindowRc) {}

    fn geometry(self: Pin<&Self>) -> Rect {
        euclid::rect(self.x(), self.y(), self.width(), self.height())
    }

    fn layout_info(self: Pin<&Self>, _orientation: Orientation, _window: &WindowRc) -> LayoutInfo {
        LayoutInfo::default()
    }

    fn input_event_filter_before_children(
        self: Pin<&Self>,
        event: MouseEvent,
        _window: &WindowRc,
        _self_rc: &ItemRc,
    ) -> InputEventFilterResult {
        if let Some(pos) = event.pos() {
            if self.clip()
                && (pos.x < 0 as _
                    || pos.y < 0 as _
                    || pos.x > self.width()
                    || pos.y > self.height())
            {
                return InputEventFilterResult::Intercept;
            }
        }
        InputEventFilterResult::ForwardAndIgnore
    }

    fn input_event(
        self: Pin<&Self>,
        _: MouseEvent,
        _window: &WindowRc,
        _self_rc: &ItemRc,
    ) -> InputEventResult {
        InputEventResult::EventIgnored
    }

    fn key_event(self: Pin<&Self>, _: &KeyEvent, _window: &WindowRc) -> KeyEventResult {
        KeyEventResult::EventIgnored
    }

    fn focus_event(self: Pin<&Self>, _: &FocusEvent, _window: &WindowRc) -> FocusEventResult {
        FocusEventResult::FocusIgnored
    }

    fn render(
        self: Pin<&Self>,
        backend: &mut ItemRendererRef,
        _self_rc: &ItemRc,
    ) -> RenderingResult {
        let clip = self.clip();
        if clip {
            (*backend).save_state();
            (*backend).combine_clip(self.geometry(), 0 as _, 0 as _)
        }
        (*backend).draw_path(self);
        if clip {
            (*backend).restore_state();
        }
        RenderingResult::ContinueRenderingChildren
    }
}

impl Path {
    /// Returns an iterator of the events of the path and an offset, so that the
    /// shape fits into the width/height of the path while respecting the stroke
    /// width.
    pub fn fitted_path_events(
        self: Pin<&Self>,
    ) -> (euclid::default::Vector2D<Coord>, PathDataIterator) {
        let stroke_width = self.stroke_width();
        let bounds_width = (self.width() - stroke_width).max(0 as _);
        let bounds_height = (self.height() - stroke_width).max(0 as _);
        let offset =
            euclid::default::Vector2D::new(stroke_width / 2 as Coord, stroke_width / 2 as Coord);

        let viewbox_width = self.viewbox_width();
        let viewbox_height = self.viewbox_height();

        let mut elements_iter = self.elements().iter();

        let maybe_viewbox = if viewbox_width > 0. && viewbox_height > 0. {
            Some(euclid::rect(self.viewbox_x(), self.viewbox_y(), viewbox_width, viewbox_height))
        } else {
            None
        };

        elements_iter.fit(bounds_width as _, bounds_height as _, maybe_viewbox);
        (offset, elements_iter)
    }
}

impl ItemConsts for Path {
    const cached_rendering_data_offset: const_field_offset::FieldOffset<Path, CachedRenderingData> =
        Path::FIELD_OFFSETS.cached_rendering_data.as_unpinned_projection();
}