urho3d/Source/Urho3D/UI/MessageBox.cpp

// Copyright (c) 2008-2022 the Urho3D project
// License: MIT

#include "../Precompiled.h"

#include "../Core/Context.h"
#include "../IO/Log.h"
#include "../Resource/ResourceCache.h"
#include "../Resource/XMLFile.h"
#include "../UI/Button.h"
#include "../UI/MessageBox.h"
#include "../UI/Text.h"
#include "../UI/UI.h"
#include "../UI/UIEvents.h"
#include "../UI/Window.h"

namespace Urho3D
{

MessageBox::MessageBox(Context* context, const String& messageString, const String& titleString, XMLFile* layoutFile,
    XMLFile* styleFile) :
    Object(context),
    window_(nullptr),
    titleText_(nullptr),
    messageText_(nullptr),
    okButton_(nullptr)
{
    // If layout file is not given, use the default message box layout
    if (!layoutFile)
    {
        auto* cache = GetSubsystem<ResourceCache>();
        layoutFile = cache->GetResource<XMLFile>("UI/MessageBox.xml");
        if (!layoutFile)    // Error is already logged
            return;         // Note: windowless MessageBox should not be used!
    }

    auto* ui = GetSubsystem<UI>();
    UIElement* root = ui->GetRoot();
    {
        SharedPtr<UIElement> holder = ui->LoadLayout(layoutFile, styleFile);
        if (!holder)    // Error is already logged
            return;
        window_ = holder;
        root->AddChild(window_);    // Take ownership of the object before SharedPtr goes out of scope
    }

    // Set the title and message strings if they are given
    titleText_ = window_->GetChildDynamicCast<Text>("TitleText", true);
    if (titleText_ && !titleString.Empty())
        titleText_->SetText(titleString);
    messageText_ = window_->GetChildDynamicCast<Text>("MessageText", true);
    if (messageText_ && !messageString.Empty())
        messageText_->SetText(messageString);

    // Center window after the message is set
    auto* window = dynamic_cast<Window*>(window_);
    if (window)
    {
        const IntVector2& size = window->GetSize();
        window->SetPosition((root->GetWidth() - size.x_) / 2, (root->GetHeight() - size.y_) / 2);
        window->SetModal(true);
        SubscribeToEvent(window, E_MODALCHANGED, URHO3D_HANDLER(MessageBox, HandleMessageAcknowledged));
    }

    // Bind the buttons (if any in the loaded UI layout) to event handlers
    okButton_ = window_->GetChildDynamicCast<Button>("OkButton", true);
    if (okButton_)
    {
        ui->SetFocusElement(okButton_);
        SubscribeToEvent(okButton_, E_RELEASED, URHO3D_HANDLER(MessageBox, HandleMessageAcknowledged));
    }
    auto* cancelButton = window_->GetChildDynamicCast<Button>("CancelButton", true);
    if (cancelButton)
        SubscribeToEvent(cancelButton, E_RELEASED, URHO3D_HANDLER(MessageBox, HandleMessageAcknowledged));
    auto* closeButton = window_->GetChildDynamicCast<Button>("CloseButton", true);
    if (closeButton)
        SubscribeToEvent(closeButton, E_RELEASED, URHO3D_HANDLER(MessageBox, HandleMessageAcknowledged));

    // Increase reference count to keep Self alive
    AddRef();
}

MessageBox::~MessageBox()
{
    // This would remove the UI-element regardless of whether it is parented to UI's root or UI's modal-root
    if (window_)
        window_->Remove();
}

void MessageBox::RegisterObject(Context* context)
{
    context->RegisterFactory<MessageBox>();
}

void MessageBox::SetTitle(const String& text)
{
    if (titleText_)
        titleText_->SetText(text);
}

void MessageBox::SetMessage(const String& text)
{
    if (messageText_)
        messageText_->SetText(text);
}

const String& MessageBox::GetTitle() const
{
    return titleText_ ? titleText_->GetText() : String::EMPTY;
}

const String& MessageBox::GetMessage() const
{
    return messageText_ ? messageText_->GetText() : String::EMPTY;
}

void MessageBox::HandleMessageAcknowledged(StringHash eventType, VariantMap& eventData)
{
    using namespace MessageACK;

    VariantMap& newEventData = GetEventDataMap();
    newEventData[P_OK] = eventData[Released::P_ELEMENT] == okButton_;
    SendEvent(E_MESSAGEACK, newEventData);

    // Self destruct
    ReleaseRef();
}

}