tabs.cpp

#include "tabs.hpp"
#include "painter.hpp"
#include "base_text_buffer.hpp"
#include "screen.hpp"
#include "application.hpp"
#include <algorithm>

Tabs::Tabs(Widget *parent):
    Widget(parent),
    activeTextBuffer_(nullptr)
{}

void Tabs::addTextBuffer(BaseTextBuffer *textBuffer)
{
    textBuffersList_.push_back(textBuffer);
    setActiveTextBuffer(textBuffer);
}

void Tabs::closeTextBuffer(BaseTextBuffer *textBuffer)
{
    auto iter = find(begin(textBuffersList_), end(textBuffersList_), activeTextBuffer_);
    if (iter == end(textBuffersList_))
        return;
    textBuffersList_.erase(iter);
    Application::instance()->queueDelete(textBuffer);
}

void Tabs::closeActiveTextBuffer()
{
    auto iter = find(begin(textBuffersList_), end(textBuffersList_), activeTextBuffer_);
    if (iter == end(textBuffersList_))
        return;
    deleteTextBuffer.emit(activeTextBuffer_);
    Application::instance()->queueDelete(activeTextBuffer_);
    iter = textBuffersList_.erase(iter);
    
    if (iter != end(textBuffersList_))
        setActiveTextBuffer(*iter);
    else if (!textBuffersList_.empty())
        setActiveTextBuffer(textBuffersList_.back());
    else
        setActiveTextBuffer(nullptr);
}

void Tabs::switchToNextTextBuffer()
{
    auto iter = find(begin(textBuffersList_), end(textBuffersList_), activeTextBuffer_);
    if (iter == end(textBuffersList_))
        return;
    ++iter;
    if (iter == end(textBuffersList_))
        return;
    setActiveTextBuffer(*iter);
}

void Tabs::switchToPrevTextBuffer()
{
    auto iter = find(begin(textBuffersList_), end(textBuffersList_), activeTextBuffer_);
    if (iter == end(textBuffersList_))
        return;
    if (*iter == textBuffersList_.front())
        return;
    --iter;
    setActiveTextBuffer(*iter);
}

void Tabs::moveTextBufferLeft()
{
    auto iter = find(begin(textBuffersList_), end(textBuffersList_), activeTextBuffer_);
    if (iter == end(textBuffersList_))
        return;
    if (*iter == textBuffersList_.front())
        return;
    std::swap(*iter, *(iter - 1));
    update();
}

void Tabs::moveTextBufferRight()
{
    auto iter = find(begin(textBuffersList_), end(textBuffersList_), activeTextBuffer_);
    if (iter == end(textBuffersList_) || iter + 1 == end(textBuffersList_))
        return;
    std::swap(*iter, *(iter + 1));
    update();
}

std::vector<BaseTextBuffer *> &Tabs::textBuffersList()
{
    return textBuffersList_;
}

const std::vector<BaseTextBuffer *> &Tabs::textBuffersList() const
{
    return textBuffersList_;
}

void Tabs::setActiveTextBuffer(BaseTextBuffer *value)
{
    activeTextBuffer_ = value;
    setTextBuffer.emit(value);
    update();
}

const BaseTextBuffer *Tabs::activeTextBuffer() const
{
    return activeTextBuffer_;
}

BaseTextBuffer *Tabs::activeTextBuffer()
{
    return activeTextBuffer_;
}

int Tabs::maxHeight() const
{
    return 20;
}

int Tabs::minHeight() const
{
    return 20;
}

void Tabs::paintEvent(PaintEvent &)
{
    Painter p(this);
    p.setColor(Gray);
    p.drawRect(0, 0, width(), height());
    int x = 0;
    for (auto buff: textBuffersList_)
    {
        auto tabName = (buff->isModified() && !buff->isReadOnly() ? L"*" : L"") + buff->name();
        auto w = tabName.size() * p.glyphWidth();
        auto bgColor = activeTextBuffer_ == buff ? Gray76 : Gray40;
        p.setColor(bgColor);
        p.drawRect(x, 0, w + p.glyphWidth() * 5 / 2, height());
        int chP = x + p.glyphWidth() / 2;
        for (auto ch: tabName)
        {
            p.renderGlyph(ch, chP, (maxHeight() - p.glyphHeight()) / 2, Black, bgColor);
            chP += p.glyphWidth();
        }
        chP += p.glyphWidth() / 2;
        p.renderGlyph(L'X', chP, (maxHeight() - p.glyphHeight()) / 2, Red, bgColor);

        x += w + p.glyphWidth() * 5 / 2;
    }
}