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implement the listbox ranged column width

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This commit is contained in:
Jinhao 2016-06-19 15:12:41 +08:00
parent 9795299447
commit 3754d3f51e
1 changed files with 128 additions and 18 deletions
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144
source/gui/widgets/listbox.cpp
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@ -555,9 +555,17 @@ namespace nana
range_width_px.first = minimum;
range_width_px.second = maximum;
if (width_px < range_width_px.first || range_width_px.second > width_px)
if (width_px < range_width_px.first)
{
width_px = range_width_px.first;
_m_refresh();
}
else if (range_width_px.second < width_px)
{
width_px = range_width_px.second;
_m_refresh();
}
}
void text_align(::nana::align align) noexcept override
{
@ -664,6 +672,92 @@ namespace nana
return pixels;
}
/// Calculates the ranged columns to make the whole header fit a specified width
/**
* @param width The width to be fittd
* @return true if the ranged columns is adjusted for the width, false otherwise.
*/
bool calc_ranged_columns(unsigned width)
{
unsigned fixed_px = 0;
unsigned minimal_px = 0;
unsigned maximal_px = 0;
unsigned ranged_px = 0;
unsigned ranged_count = 0;
for (auto & col : cont_)
{
if (col.visible_state)
{
if (col.range_width_px.first == col.range_width_px.second)
{
fixed_px += col.width_px;
continue;
}
minimal_px += col.range_width_px.first;
maximal_px += col.range_width_px.second;
ranged_px += col.width_px;
++ranged_count;
}
}
//Don't calculate the ranged columns if
//There isn't a ranged column while maximal_px == 0, or
//ranged_px + fixed_px == width, or
//the minimal ranged size is larger than width
if ((0 == maximal_px) || (ranged_px + fixed_px == width) || (fixed_px + minimal_px > width))
return false;
if (ranged_px + fixed_px > width)
{
auto delta_px = ranged_px + fixed_px - width;
while (delta_px)
{
for (auto & col : cont_)
{
if (0 == delta_px)
break;
if (col.visible_state && (col.range_width_px.first < col.range_width_px.second))
{
if (col.range_width_px.first < col.width_px)
{
--col.width_px;
--delta_px;
}
}
}
}
}
else
{
auto delta_px = width - (ranged_px + fixed_px);
while (delta_px)
{
for (auto & col : cont_)
{
if (0 == delta_px)
break;
if (col.visible_state && (col.range_width_px.first < col.range_width_px.second))
{
if (col.width_px < col.range_width_px.second)
{
++col.width_px;
--delta_px;
}
}
}
}
}
return true;
}
const container& cont() const
{
return cont_;
@ -2205,23 +2299,36 @@ namespace nana
internal_scope_guard lock;
const nana::size sz = graph->size();
unsigned header_s = header.pixels();
window wd = lister.wd_ptr()->handle();
// Adjust the ranged column assume the vertical scrollbar is enabled.
auto range_adjusted = !this->header.calc_ranged_columns(sz.width - 2 - scroll.scale);
auto columns_pixels = header.pixels();
//H scroll enabled
bool h = (header_s + 4 > sz.width ); // 4px = left and right borders(2px) + left and right gaps(2px)
unsigned head_scroll = 2 + header_visible_px() + (h ? scroll.scale : 0); // 2px left and right gaps(2px)
//If range_adjusted is true, it indicates no horzontal scroll bar is enabled.
bool enable_horz = (range_adjusted && (columns_pixels + 4 > sz.width)); // 4px = left and right borders(2px) + left and right gaps(2px)
unsigned head_scroll = 2 + header_visible_px() + (enable_horz ? scroll.scale : 0); // 2px left and right gaps(2px)
unsigned lister_s = sz.height > head_scroll ? sz.height - head_scroll : 0;
size_type screen_number = (lister_s / scheme_ptr->item_height);
//V scroll enabled
bool v = (lister.the_number_of_expanded() > screen_number);
auto enable_vert = (lister.the_number_of_expanded() > screen_number);
if(v == true && h == false)
h = ( (header_s + 2 + scroll.scale ) > sz.width);
if (enable_vert)
{
if (!enable_horz)
enable_horz = ((columns_pixels + 2 + scroll.scale) > sz.width);
}
else if (range_adjusted)
{
//No vertical scrollbar, then re-adjust the range columns for a new width that excludes vert scroll.
this->header.calc_ranged_columns(sz.width - 2);
}
unsigned width = sz.width - 2 - (v ? scroll.scale : 0);
unsigned height = sz.height - 2 - (h ? scroll.scale : 0);
unsigned width = sz.width - 2 - (enable_vert ? scroll.scale : 0);
unsigned height = sz.height - 2 - (enable_horz ? scroll.scale : 0);
//event hander for scrollbars
auto evt_fn = [this](const arg_scroll& arg)
@ -2244,13 +2351,16 @@ namespace nana
API::refresh_window(this->lister.wd_ptr()->handle());
};
if(h)
const auto wd_handle = lister.wd_ptr()->handle();
if (enable_horz)
{
rectangle r(1, sz.height - scroll.scale - 1, width, scroll.scale);
if(scroll.h.empty())
{
scroll.h.create(wd, r);
API::take_active(scroll.h.handle(), false, wd);
scroll.h.create(wd_handle, r);
API::take_active(scroll.h.handle(), false, wd_handle);
scroll.h.events().value_changed.connect_unignorable(evt_fn);
}
else
@ -2259,13 +2369,13 @@ namespace nana
else if(!scroll.h.empty())
scroll.h.close();
if(v)
if (enable_vert)
{
rectangle r(sz.width - 1 - scroll.scale, 1, scroll.scale, height);
if(scroll.v.empty())
{
scroll.v.create(wd, r);
API::take_active(scroll.v.handle(), false, wd);
scroll.v.create(wd_handle, r);
API::take_active(scroll.v.handle(), false, wd_handle);
scroll.v.events().value_changed.connect_unignorable(evt_fn);
}
else
@ -3310,7 +3420,7 @@ namespace nana
graph->string({ x + 25 + static_cast<int>(text_s), y + txtoff }, str);
if (x + 35 + extend_text_w < x + width)
if (x + 35 + static_cast<int>(extend_text_w) < x + static_cast<int>(width))
{
::nana::point pos{ x + 30 + static_cast<int>(extend_text_w), y + static_cast<int>(essence_->scheme_ptr->item_height) / 2 };
graph->line(pos, { x + static_cast<int>(width)-5, pos.y }, txt_color);