terminal/src/cascadia/TerminalSettingsEditor/ControlSizeTrigger.cpp at 6383fff42b15471595941bcc784fbcfaefe9e76a · microsoft/terminal · GitHub

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
// Copyright (c) Microsoft Corporation.
// Licensed under the MIT license.

#include "pch.h"
#include "ControlSizeTrigger.h"
#include "ControlSizeTrigger.g.cpp"

#include <limits>

using namespace winrt::Windows::Foundation;
using namespace winrt::Windows::UI::Xaml;

namespace winrt::Microsoft::Terminal::Settings::Editor::implementation
{
    DependencyProperty ControlSizeTrigger::_CanTriggerProperty{ nullptr };
    DependencyProperty ControlSizeTrigger::_MinWidthProperty{ nullptr };
    DependencyProperty ControlSizeTrigger::_MaxWidthProperty{ nullptr };
    DependencyProperty ControlSizeTrigger::_MinHeightProperty{ nullptr };
    DependencyProperty ControlSizeTrigger::_MaxHeightProperty{ nullptr };
    DependencyProperty ControlSizeTrigger::_TargetElementProperty{ nullptr };

    ControlSizeTrigger::ControlSizeTrigger()
    {
        _InitializeProperties();
    }

    void ControlSizeTrigger::_InitializeProperties()
    {
        // Defaults mirror the toolkit: trigger is always evaluatable, bounds
        // are wide open, no target element until one is bound.
        if (!_CanTriggerProperty)
        {
            _CanTriggerProperty = DependencyProperty::Register(
                L"CanTrigger",
                xaml_typename<bool>(),
                xaml_typename<Editor::ControlSizeTrigger>(),
                PropertyMetadata{ box_value(true), PropertyChangedCallback{ &ControlSizeTrigger::_OnTriggerInputChanged } });
        }
        if (!_MinWidthProperty)
        {
            _MinWidthProperty = DependencyProperty::Register(
                L"MinWidth",
                xaml_typename<double>(),
                xaml_typename<Editor::ControlSizeTrigger>(),
                PropertyMetadata{ box_value(0.0), PropertyChangedCallback{ &ControlSizeTrigger::_OnTriggerInputChanged } });
        }
        if (!_MaxWidthProperty)
        {
            _MaxWidthProperty = DependencyProperty::Register(
                L"MaxWidth",
                xaml_typename<double>(),
                xaml_typename<Editor::ControlSizeTrigger>(),
                PropertyMetadata{ box_value(std::numeric_limits<double>::infinity()), PropertyChangedCallback{ &ControlSizeTrigger::_OnTriggerInputChanged } });
        }
        if (!_MinHeightProperty)
        {
            _MinHeightProperty = DependencyProperty::Register(
                L"MinHeight",
                xaml_typename<double>(),
                xaml_typename<Editor::ControlSizeTrigger>(),
                PropertyMetadata{ box_value(0.0), PropertyChangedCallback{ &ControlSizeTrigger::_OnTriggerInputChanged } });
        }
        if (!_MaxHeightProperty)
        {
            _MaxHeightProperty = DependencyProperty::Register(
                L"MaxHeight",
                xaml_typename<double>(),
                xaml_typename<Editor::ControlSizeTrigger>(),
                PropertyMetadata{ box_value(std::numeric_limits<double>::infinity()), PropertyChangedCallback{ &ControlSizeTrigger::_OnTriggerInputChanged } });
        }
        if (!_TargetElementProperty)
        {
            _TargetElementProperty = DependencyProperty::Register(
                L"TargetElement",
                xaml_typename<FrameworkElement>(),
                xaml_typename<Editor::ControlSizeTrigger>(),
                PropertyMetadata{ nullptr, PropertyChangedCallback{ &ControlSizeTrigger::_OnTargetElementChanged } });
        }
    }

    void ControlSizeTrigger::_OnTriggerInputChanged(const DependencyObject& d, const DependencyPropertyChangedEventArgs& /*e*/)
    {
        if (const auto obj{ d.try_as<Editor::ControlSizeTrigger>() })
        {
            get_self<ControlSizeTrigger>(obj)->_UpdateTrigger();
        }
    }

    void ControlSizeTrigger::_OnTargetElementChanged(const DependencyObject& d, const DependencyPropertyChangedEventArgs& e)
    {
        const auto obj{ d.try_as<Editor::ControlSizeTrigger>() };
        if (!obj)
        {
            return;
        }
        const auto oldElement = e.OldValue().try_as<FrameworkElement>();
        const auto newElement = e.NewValue().try_as<FrameworkElement>();
        get_self<ControlSizeTrigger>(obj)->_UpdateTargetElement(oldElement, newElement);
    }

    void ControlSizeTrigger::_UpdateTargetElement(const FrameworkElement& /*oldValue*/, const FrameworkElement& newValue)
    {
        // Revoking handles both unhooking the previous element and a null `newValue`.
        _sizeChangedRevoker.revoke();
        if (newValue)
        {
            _sizeChangedRevoker = newValue.SizeChanged(winrt::auto_revoke, [weakThis = get_weak()](auto&&, auto&&) {
                if (const auto strongThis = weakThis.get())
                {
                    strongThis->_UpdateTrigger();
                }
            });
        }
        _UpdateTrigger();
    }

    void ControlSizeTrigger::_UpdateTrigger()
    {
        const auto target = TargetElement();
        if (!target || !CanTrigger())
        {
            _isActive = false;
            SetActive(false);
            return;
        }

        const auto width = target.ActualWidth();
        const auto height = target.ActualHeight();

        const bool activate =
            MinWidth() <= width &&
            width < MaxWidth() &&
            MinHeight() <= height &&
            height < MaxHeight();

        _isActive = activate;
        SetActive(activate);
    }
}