PaintBrush: Add "Create new layer..." action

This action pops up a dialog asking for a name + dimensions. If OK is
clicked, you get a new layer with those specifications. :^)

Applications/PaintBrush/CreateNewLayerDialog.cpp

@@ -0,0 +1,94 @@
+/*
+ * 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 "CreateNewLayerDialog.h"
+#include <LibGUI/BoxLayout.h>
+#include <LibGUI/Button.h>
+#include <LibGUI/Label.h>
+#include <LibGUI/SpinBox.h>
+#include <LibGUI/TextBox.h>
+
+namespace PaintBrush {
+
+CreateNewLayerDialog::CreateNewLayerDialog(const Gfx::Size& suggested_size, GUI::Window* parent_window)
+    : Dialog(parent_window)
+{
+    set_title("Create new layer");
+    resize(200, 200);
+
+    auto& main_widget = set_main_widget<GUI::Widget>();
+    main_widget.set_fill_with_background_color(true);
+
+    auto& layout = main_widget.set_layout<GUI::VerticalBoxLayout>();
+    layout.set_margins({ 4, 4, 4, 4 });
+
+    auto& name_label = main_widget.add<GUI::Label>("Name:");
+    name_label.set_text_alignment(Gfx::TextAlignment::CenterLeft);
+
+    m_name_textbox = main_widget.add<GUI::TextBox>();
+    m_name_textbox->on_change = [this] {
+        m_layer_name = m_name_textbox->text();
+    };
+
+    auto& width_label = main_widget.add<GUI::Label>("Width:");
+    width_label.set_text_alignment(Gfx::TextAlignment::CenterLeft);
+
+    auto& width_spinbox = main_widget.add<GUI::SpinBox>();
+
+    auto& height_label = main_widget.add<GUI::Label>("Height:");
+    height_label.set_text_alignment(Gfx::TextAlignment::CenterLeft);
+
+    auto& height_spinbox = main_widget.add<GUI::SpinBox>();
+
+    auto& button_container = main_widget.add<GUI::Widget>();
+    button_container.set_layout<GUI::HorizontalBoxLayout>();
+
+    auto& ok_button = button_container.add<GUI::Button>("OK");
+    ok_button.on_click = [this](auto) {
+        done(ExecOK);
+    };
+
+    auto& cancel_button = button_container.add<GUI::Button>("Cancel");
+    cancel_button.on_click = [this](auto) {
+        done(ExecCancel);
+    };
+
+    width_spinbox.on_change = [this](int value) {
+        m_layer_size.set_width(value);
+    };
+
+    height_spinbox.on_change = [this](int value) {
+        m_layer_size.set_height(value);
+    };
+
+    width_spinbox.set_range(0, 16384);
+    height_spinbox.set_range(0, 16384);
+
+    width_spinbox.set_value(suggested_size.width());
+    height_spinbox.set_value(suggested_size.height());
+}
+
+}

Applications/PaintBrush/CreateNewLayerDialog.h

@@ -0,0 +1,48 @@
+/*
+ * 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>
+
+namespace PaintBrush {
+
+class CreateNewLayerDialog final : public GUI::Dialog {
+    C_OBJECT(CreateNewLayerDialog);
+public:
+    const Gfx::Size& layer_size() const { return m_layer_size; }
+    const String& layer_name() const { return m_layer_name; }
+
+private:
+    CreateNewLayerDialog(const Gfx::Size& suggested_size, GUI::Window* parent_window);
+
+    Gfx::Size m_layer_size;
+    String m_layer_name;
+
+    RefPtr<GUI::TextBox> m_name_textbox;
+};
+
+}

Applications/PaintBrush/Makefile

@@ -1,5 +1,6 @@
 OBJS = \
     BucketTool.o \
+    CreateNewLayerDialog.o \
     EllipseTool.o \
     EraseTool.o \
     Image.o \

Applications/PaintBrush/main.cpp

@@ -24,6 +24,7 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#include "CreateNewLayerDialog.h"
 #include "Image.h"
 #include "ImageEditor.h"
 #include "Layer.h"
@@ -122,6 +123,20 @@ int main(int argc, char** argv)
         return IterationDecision::Continue;
     });
 
+    auto& layer_menu = menubar->add_menu("Layer");
+    layer_menu.add_action(GUI::Action::create("Create new layer...", { Mod_Ctrl | Mod_Shift, Key_N }, [&](auto&) {
+        auto dialog = PaintBrush::CreateNewLayerDialog::construct(image_editor.image()->size(), window);
+        if (dialog->exec() == GUI::Dialog::ExecOK) {
+            auto layer = PaintBrush::Layer::create_with_size(dialog->layer_size(), dialog->layer_name());
+            if (!layer) {
+                GUI::MessageBox::show_error(String::format("Unable to create layer with size %s", dialog->size().to_string().characters()));
+                return;
+            }
+            image_editor.image()->add_layer(layer.release_nonnull());
+            image_editor.layers_did_change();
+        }
+    }, window));
+
     auto& help_menu = menubar->add_menu("Help");
     help_menu.add_action(GUI::Action::create("About", [&](auto&) {
         GUI::AboutDialog::show("PaintBrush", Gfx::Bitmap::load_from_file("/res/icons/32x32/app-paintbrush.png"), window);