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Message Scroller

A scrollable message surface with end tracking and accessible scroll controls.

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Live C++Source and licences
#include <QApplication>
#include <QFile>
#include <QHBoxLayout>
#include <QLabel>
#include <QPainter>
#include <QStandardItemModel>
#include <QUrl>
#include <QVBoxLayout>
#include <array>
#ifdef SHADCN_GALLERY_MEDIA
#include <shadcn/media.hpp>
#endif
#include <shadcn/shadcn.hpp>

QWidget* example(QWidget* parent = nullptr) {
    using namespace shadcn;
    auto* canvas = new QWidget(parent);
    canvas->setAutoFillBackground(true);
    auto* outer = new QHBoxLayout(canvas);
    outer->setContentsMargins(32, 32, 32, 32);
    auto* host = new QWidget(canvas);
    auto* layout = new QVBoxLayout(host);
    layout->setContentsMargins(0, 0, 0, 0);
    layout->setSpacing(16);
    outer->addStretch();
    outer->addWidget(host, 0, Qt::AlignCenter);
    outer->addStretch();
    auto* scroller = new MessageScroller(host);
    scroller->setFixedSize(400, 220);
    for (const auto* text : {"Hi Alex, is the project ready?", "Yes. The components are in place.", "Can you send me a preview?", "Here it is. Let me know what you think."}) {
        auto* message = new Message(scroller);
        message->setText(text);
        scroller->addWidget(*message);
    }
    layout->addWidget(scroller);
    return canvas;
}

Installation​

add_subdirectory(shadcn-cpp)
target_link_libraries(app PRIVATE shadcn::widgets)

Usage​

#include <shadcn/feedback.hpp>

shadcn::MessageScroller scroller(parent);
auto& message = shadcn::make_child<shadcn::Message>(scroller);
message.setText("New message");
scroller.addWidget(message);
scroller.scrollToEnd();

API​

scrollToStart, scrollToEnd, isAtStart, isAtEnd and setAutoScroll control the viewport.

Variations​

Use addItem for a grouped scroller row and listen to visibility signals for external indicators.

Keyboard and accessibility​

Qt supplies native focus, keyboard interaction and accessible object roles. Give the component a visible label or an accessible name when its text alone does not explain the action.

Ownership​

The parent widget owns the component. Child widgets created through a component layout follow Qt parent ownership. References returned by helper methods are borrowed.