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#include "textviewwidget.h"
#include <algorithm>
#include "utils.h"
namespace newsboat {
TextviewWidget::TextviewWidget(const std::string& textview_name,
Stfl::Form& form)
: textview_name(textview_name)
, form(form)
, num_lines(0)
{
}
void TextviewWidget::stfl_replace_textview(std::uint32_t number_of_lines,
std::string stfl)
{
num_lines = number_of_lines;
form.modify(textview_name, "replace", stfl);
}
void TextviewWidget::stfl_replace_lines(std::uint32_t number_of_lines,
std::string stfl)
{
num_lines = number_of_lines;
form.modify(textview_name, "replace_inner", stfl);
if (num_lines == 0) {
set_scroll_offset(0);
} else {
const std::uint32_t max_offset = num_lines - 1;
const std::uint32_t current_offset = get_scroll_offset();
if (current_offset > max_offset) {
set_scroll_offset(max_offset);
}
}
}
void TextviewWidget::scroll_up()
{
const std::uint32_t offset = get_scroll_offset();
if (offset > 0) {
set_scroll_offset(offset - 1);
}
}
void TextviewWidget::scroll_down()
{
if (num_lines == 0) {
// Ignore if list is empty
return;
}
const std::uint32_t maxoffset = num_lines - 1;
const std::uint32_t offset = get_scroll_offset();
if (offset < maxoffset) {
set_scroll_offset(offset + 1);
}
}
void TextviewWidget::scroll_to_top()
{
set_scroll_offset(0);
}
void TextviewWidget::scroll_to_bottom()
{
if (num_lines == 0) {
// Ignore if list is empty
return;
}
const std::uint32_t maxoffset = num_lines - 1;
const std::uint32_t widget_height = get_height();
if (maxoffset + 2 < widget_height) {
set_scroll_offset(0);
} else {
set_scroll_offset((maxoffset + 2) - widget_height);
}
}
void TextviewWidget::scroll_page_up()
{
const std::uint32_t offset = get_scroll_offset();
const std::uint32_t widget_height = get_height();
if (offset + 1 > widget_height) {
set_scroll_offset((offset + 1) - widget_height);
} else {
set_scroll_offset(0);
}
}
void TextviewWidget::scroll_page_down()
{
if (num_lines == 0) {
// Ignore if list is empty
return;
}
const std::uint32_t maxoffset = num_lines - 1;
const std::uint32_t offset = get_scroll_offset();
const std::uint32_t widget_height = get_height();
if (offset + widget_height - 1 < maxoffset) {
set_scroll_offset(offset + widget_height - 1);
} else {
set_scroll_offset(maxoffset);
}
}
void TextviewWidget::scroll_halfpage_up()
{
const std::uint32_t offset = get_scroll_offset();
const std::uint32_t widget_height = get_height();
const std::uint32_t scroll_amount = (widget_height + 1) / 2;
if (offset >= scroll_amount) {
set_scroll_offset(offset - scroll_amount);
} else {
set_scroll_offset(0);
}
}
void TextviewWidget::scroll_halfpage_down()
{
if (num_lines == 0) {
// Ignore if list is empty
return;
}
const std::uint32_t maxoffset = num_lines - 1;
const std::uint32_t offset = get_scroll_offset();
const std::uint32_t widget_height = get_height();
const std::uint32_t scroll_amount = (widget_height + 1) / 2;
if (offset + scroll_amount <= maxoffset) {
set_scroll_offset(offset + scroll_amount);
} else {
set_scroll_offset(maxoffset);
}
}
std::uint32_t TextviewWidget::get_scroll_offset()
{
const std::string offset = form.get(textview_name + "_offset");
if (!offset.empty()) {
return std::max(0, std::stoi(offset));
}
return 0;
}
void TextviewWidget::set_scroll_offset(std::uint32_t offset)
{
form.set(textview_name + "_offset", std::to_string(offset));
}
std::uint32_t TextviewWidget::get_width()
{
return utils::to_u(form.get(textview_name + ":w"));
}
std::uint32_t TextviewWidget::get_height()
{
return utils::to_u(form.get(textview_name + ":h"));
}
} // namespace newsboat
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