LibGUI: Add a GUI::FontPicker dialog class :^)

This allows you to pick & choose a font by selecting the family, weight
and size you want. It shows you a nice preview sentence and everything.

Libraries/LibGUI/CMakeLists.txt

@@ -1,3 +1,5 @@
+compile_gml(FontPickerDialog.gml FontPickerDialogGML.h font_picker_dialog_gml)
+
 set(SOURCES
     AboutDialog.cpp
     AbstractButton.cpp
@@ -31,6 +33,8 @@ set(SOURCES
     FilePicker.cpp
     FileSystemModel.cpp
     FilteringProxyModel.cpp
+    FontPicker.cpp
+    FontPickerDialogGML.h
     Frame.cpp
     GMLLexer.cpp
     GMLParser.cpp

Libraries/LibGUI/FontPicker.cpp

@@ -0,0 +1,177 @@
+/*
+ * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <LibGUI/Button.h>
+#include <LibGUI/FontPicker.h>
+#include <LibGUI/FontPickerDialogGML.h>
+#include <LibGUI/ItemListModel.h>
+#include <LibGUI/Label.h>
+#include <LibGUI/ListView.h>
+#include <LibGUI/Widget.h>
+#include <LibGfx/FontDatabase.h>
+
+namespace GUI {
+
+FontPicker::FontPicker(Window* parent_window, const Gfx::Font* current_font)
+    : Dialog(parent_window)
+{
+    set_title("Font picker");
+    resize(540, 300);
+    set_icon(Gfx::Bitmap::load_from_file("/res/icons/16x16/app-font-editor.png"));
+
+    auto& widget = set_main_widget<GUI::Widget>();
+    if (!widget.load_from_gml(font_picker_dialog_gml))
+        ASSERT_NOT_REACHED();
+
+    m_family_list_view = static_cast<ListView&>(*widget.find_descendant_by_name("family_list_view"));
+    m_weight_list_view = static_cast<ListView&>(*widget.find_descendant_by_name("weight_list_view"));
+    m_size_list_view = static_cast<ListView&>(*widget.find_descendant_by_name("size_list_view"));
+    m_sample_text_label = static_cast<Label&>(*widget.find_descendant_by_name("sample_text_label"));
+
+    HashTable<String> families;
+    Gfx::FontDatabase::the().for_each_font([&](auto& font) {
+        families.set(font.family());
+    });
+
+    for (auto& family : families)
+        m_families.append(family);
+
+    m_family_list_view->set_model(ItemListModel<String>::create(m_families));
+
+    m_family_list_view->on_selection = [this](auto& index) {
+        m_family = index.data().to_string();
+        HashTable<int> weights;
+        Gfx::FontDatabase::the().for_each_font([&](auto& font) {
+            if (font.family() == m_family.value())
+                weights.set(font.weight());
+        });
+        m_weights.clear();
+        Optional<size_t> index_of_old_weight_in_new_list;
+        size_t i = 0;
+        for (auto& weight : weights) {
+            m_weights.append(weight);
+            if (m_weight.has_value() && weight == m_weight.value())
+                index_of_old_weight_in_new_list = i;
+            ++i;
+        }
+
+        m_weight_list_view->set_model(ItemListModel<int>::create(m_weights));
+        m_weight_list_view->set_cursor(m_weight_list_view->model()->index(index_of_old_weight_in_new_list.value_or(0)), GUI::AbstractView::SelectionUpdate::Set);
+        update_sample_label();
+    };
+
+    m_weight_list_view->on_selection = [this](auto& index) {
+        m_weight = index.data().to_i32();
+        m_sizes.clear();
+        Optional<size_t> index_of_old_size_in_new_list;
+        Gfx::FontDatabase::the().for_each_font([&](auto& font) {
+            if (font.family() == m_family.value() && font.weight() == m_weight.value()) {
+                if (m_size.has_value() && m_size.value() == font.presentation_size())
+                    index_of_old_size_in_new_list = m_sizes.size();
+                m_sizes.append(font.presentation_size());
+            }
+        });
+
+        m_size_list_view->set_model(ItemListModel<int>::create(m_sizes));
+        m_size_list_view->set_cursor(m_size_list_view->model()->index(index_of_old_size_in_new_list.value_or(0)), GUI::AbstractView::SelectionUpdate::Set);
+        update_sample_label();
+    };
+
+    m_size_list_view->on_selection = [this](auto& index) {
+        m_size = index.data().to_i32();
+        update_sample_label();
+    };
+
+    auto& ok_button = static_cast<Button&>(*widget.find_descendant_by_name("ok_button"));
+    ok_button.on_click = [this](auto) {
+        done(ExecOK);
+    };
+
+    auto& cancel_button = static_cast<Button&>(*widget.find_descendant_by_name("cancel_button"));
+    cancel_button.on_click = [this](auto) {
+        done(ExecCancel);
+    };
+
+    set_font(current_font);
+}
+
+FontPicker::~FontPicker()
+{
+}
+
+void FontPicker::set_font(const Gfx::Font* font)
+{
+    if (m_font == font)
+        return;
+    m_font = font;
+    m_sample_text_label->set_font(m_font);
+
+    if (!m_font) {
+        m_weights.clear();
+        m_sizes.clear();
+        m_weight_list_view->set_model(nullptr);
+        m_size_list_view->set_model(nullptr);
+        return;
+    }
+
+    size_t family_index = 0;
+    for (size_t i = 0; i < m_families.size(); ++i) {
+        if (m_families[i] == m_font->family()) {
+            family_index = i;
+            break;
+        }
+    }
+
+    m_family_list_view->set_cursor(m_family_list_view->model()->index(family_index), GUI::AbstractView::SelectionUpdate::Set);
+
+    size_t weight_index = 0;
+    for (size_t i = 0; i < m_weights.size(); ++i) {
+        if (m_weights[i] == m_font->weight()) {
+            weight_index = i;
+            break;
+        }
+    }
+
+    m_weight_list_view->set_cursor(m_weight_list_view->model()->index(weight_index), GUI::AbstractView::SelectionUpdate::Set);
+
+    size_t size_index = 0;
+    for (size_t i = 0; i < m_sizes.size(); ++i) {
+        if (m_sizes[i] == m_font->presentation_size()) {
+            size_index = i;
+            break;
+        }
+    }
+
+    m_size_list_view->set_cursor(m_size_list_view->model()->index(size_index), GUI::AbstractView::SelectionUpdate::Set);
+}
+
+void FontPicker::update_sample_label()
+{
+    if (m_family.has_value() && m_size.has_value() && m_weight.has_value())
+        set_font(Gfx::FontDatabase::the().get(m_family.value(), m_size.value(), m_weight.value()));
+}
+
+}

Libraries/LibGUI/FontPicker.h

@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <LibGUI/Dialog.h>
+#include <LibGfx/Forward.h>
+
+namespace GUI {
+
+class FontPicker final : public GUI::Dialog {
+    C_OBJECT(FontPicker);
+
+public:
+    virtual ~FontPicker() override;
+
+    RefPtr<Gfx::Font> font() const { return m_font; }
+    void set_font(const Gfx::Font*);
+
+private:
+    FontPicker(Window* parent_window = nullptr, const Gfx::Font* current_font = nullptr);
+
+    void update_sample_label();
+
+    RefPtr<Gfx::Font> m_font;
+
+    RefPtr<ListView> m_family_list_view;
+    RefPtr<ListView> m_weight_list_view;
+    RefPtr<ListView> m_size_list_view;
+    RefPtr<Label> m_sample_text_label;
+
+    Vector<String> m_families;
+    Vector<int> m_weights;
+    Vector<int> m_sizes;
+
+    Optional<String> m_family;
+    Optional<int> m_weight;
+    Optional<int> m_size;
+};
+
+}

Libraries/LibGUI/FontPickerDialog.gml

@@ -0,0 +1,91 @@
+@GUI::Widget {
+    fill_with_background_color: true
+
+    layout: @GUI::VerticalBoxLayout {
+        margins: [4, 4, 4, 4]
+    }
+
+    @GUI::Widget {
+        layout: @GUI::HorizontalBoxLayout {
+        }
+
+        @GUI::Widget {
+            layout: @GUI::VerticalBoxLayout {
+            }
+
+            @GUI::Label {
+                text: "Family:"
+                text_alignment: "CenterLeft"
+                fixed_height: 16
+            }
+
+            @GUI::ListView {
+                name: "family_list_view"
+            }
+        }
+
+        @GUI::Widget {
+            layout: @GUI::VerticalBoxLayout {
+            }
+
+            @GUI::Label {
+                text: "Weight:"
+                text_alignment: "CenterLeft"
+                fixed_height: 16
+            }
+
+            @GUI::ListView {
+                name: "weight_list_view"
+            }
+        }
+
+        @GUI::Widget {
+            layout: @GUI::VerticalBoxLayout {
+            }
+
+            @GUI::Label {
+                text: "Size:"
+                text_alignment: "CenterLeft"
+                fixed_height: 16
+            }
+
+            @GUI::ListView {
+                name: "size_list_view"
+            }
+        }
+    }
+
+    @GUI::GroupBox {
+        layout: @GUI::VerticalBoxLayout {
+        }
+
+        title: "Sample text"
+        fixed_height: 100
+
+        @GUI::Label {
+            name: "sample_text_label"
+            text: "The quick brown fox jumps over the lazy dog."
+        }
+    }
+
+    @GUI::Widget {
+        fixed_height: 22
+        layout: @GUI::HorizontalBoxLayout {
+        }
+
+        @GUI::Widget {
+        }
+
+        @GUI::Button {
+            name: "ok_button"
+            text: "OK"
+            fixed_width: 80
+        }
+
+        @GUI::Button {
+            name: "cancel_button"
+            text: "Cancel"
+            fixed_width: 80
+        }
+    }
+}