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Change: Add optional text labels to slider widget.

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This commit is contained in:
Peter Nelson
2022-10-23 15:45:47 +01:00
committed by PeterN
parent f0ae111c4a
commit 123983743f
6 changed files with 29 additions and 11 deletions
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23
src/widgets/slider.cpp
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@@ -24,13 +24,18 @@ static const int SLIDER_WIDTH = 3;
* @param min_value Minimum value of slider
* @param max_value Maximum value of slider
* @param value Value to put the slider at
* @param labels List of positions and labels to draw along the slider.
*/
void DrawSliderWidget(Rect r, int min_value, int max_value, int value)
void DrawSliderWidget(Rect r, int min_value, int max_value, int value, const std::map<int, StringID> &labels)
{
/* Allow space for labels. We assume they are in the small font. */
if (labels.size() > 0) r.bottom -= FONT_HEIGHT_SMALL + WidgetDimensions::scaled.hsep_normal;
max_value -= min_value;
/* Draw a wedge indicating low to high value. */
const int ha = (r.bottom - r.top) / 5;
const int sw = ScaleGUITrad(SLIDER_WIDTH);
const int t = WidgetDimensions::scaled.bevel.top; /* Thickness of lines */
int wx1 = r.left + sw / 2;
int wx2 = r.right - sw / 2;
@@ -44,10 +49,22 @@ void DrawSliderWidget(Rect r, int min_value, int max_value, int value)
GfxDrawLine(wedge[1].x, wedge[1].y, wedge[2].x, wedge[2].y, _current_text_dir == TD_RTL ? shadow : light, t);
GfxDrawLine(wedge[0].x, wedge[0].y, wedge[1].x, wedge[1].y, shadow, t);
int x;
for (auto label : labels) {
x = label.first - min_value;
if (_current_text_dir == TD_RTL) x = max_value - x;
x = r.left + (x * (r.right - r.left - sw) / max_value) + sw / 2;
GfxDrawLine(x, r.bottom - ha + 1, x, r.bottom + (label.second == STR_NULL ? 0 : WidgetDimensions::scaled.hsep_normal), shadow, t);
if (label.second != STR_NULL) {
Dimension d = GetStringBoundingBox(label.second, FS_SMALL);
x = Clamp(x - d.width / 2, r.left, r.right - d.width);
DrawString(x, x + d.width, r.bottom + 1 + WidgetDimensions::scaled.hsep_normal, label.second, TC_BLACK, SA_CENTER, false, FS_SMALL);
}
}
/* Draw a slider handle indicating current value. */
const int sw = ScaleGUITrad(SLIDER_WIDTH);
if (_current_text_dir == TD_RTL) value = max_value - value;
const int x = r.left + ((value - min_value) * (r.right - r.left - sw) / max_value);
x = r.left + ((value - min_value) * (r.right - r.left - sw) / max_value);
DrawFrameRect(x, r.top, x + sw, r.bottom, COLOUR_GREY, FR_NONE);
}

3
src/widgets/slider_func.h
View File

@@ -13,8 +13,9 @@
#include "../window_type.h"
#include "../gfx_func.h"
#include <map>
void DrawSliderWidget(Rect r, int min_value, int max_value, int value);
void DrawSliderWidget(Rect r, int min_value, int max_value, int value, const std::map<int, StringID> &labels);
bool ClickSliderWidget(Rect r, Point pt, int min_value, int max_value, int &value);
inline bool ClickSliderWidget(Rect r, Point pt, int min_value, int max_value, byte &value)